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Dustin Johnson confidently strode into the media centre at the Canadian Open for yet another press conference.

After explaining how he had blasted himself into a share of the lead after three rounds at Toronto's famed Glen Abbey, the world No.1 said: "Hopefully, I'll see ya'll tomorrow."

Johnson, whose fiancee Paulina is the daughter of Canadian ice hockey great Wayne Gretzky, wants to conduct a winner's press conference.

His tongue-in-cheek joke was in reference to a stellar record at Glen Abbey that is yet to yield a victory - two runner-ups (2013 and 2016) and a tie for eighth last year.

Proving the Jack Nicklaus-designed layout is horses for courses, big-hitting Johnson fired a seven-under-par 65 to earn a 17-under total alongside Byeong Hun An (66), Kevin Tway (68) and Whee Kim (67).

A distant four shots back are Hudson Swafford (67) and South African veteran Rory Sabbatini (68) sharing fifth at 13 under.

Johnson jumped out of the gates with five front-nine birdies before bogeys at the 10th and par-5 13th.

The former US Open winner responded with birdies at the 14th and 15th, then smashed an astonishing 374-yard drive at the par-5 16th before hitting his approach to 23 feet and draining the eagle putt.

Searching for his 19th US Tour title and third of 2018, Johnson likes his chances of victory and will play in Sunday's final group with 26-year-old Korean An.

"I like the golf course and I feel like my game is in really good form; I've got a lot of confidence in it," Johnson said.

"I'm going to have to go out and play really well, play aggressive, and make a lot of birdies."

Johnson's astonishing power off the tee was on full display, averaging 314.6 yards which allowed him short irons for second shots into the par 5s.

Still, the athletic 34-year-old wasn't satisfied with his performance on the long holes.

"I hit wedge and 9-iron into the No.16 and 18," he said.

"But I need to play the par-5s a little better; I haven't played all four of them good."

Meanwhile, Australia's Aaron Baddeley started the day in contention but tumbled down the leaderboard with a 75 leaving him at seven under and 10 shots off the pace.

Baddeley's countrymen Rod Pampling (75, four under) and Cameron Percy (77, three under) struggled.

Aaron Baddeley has lamented squandering a red-hot chance at final-round contention with a sloppy performance on day three at the US PGA Tour's Canadian Open.

The 37-year-old Australian started moving day at Toronto's famed Glen Abbey course just four shots off the pace, only to tumble down the leaderboard with a three-over-par 75 leaving him at seven under and 10 shots back of the 54-hole lead.

World No.1 Dustin Johnson blasted his way into a four-way tie atop the leaderboard.

His seven-under 65 earning him a 17-under total alongside Byeong Hun An (66), Whee Kim (67) and Kevin Tway (68).

A distant four shots back are Hudson Swafford (67) and South African veteran Rory Sabbatini (68) in a tie for fifth at 13 under.

Big-hitting Johnson, who has two runner-up results at the Canadian Open, will play in the final group with the 26-year-old Korean An.

In the hunt for his first US Tour victory in two years, Baddeley was left to rue a poor performance with the driver, hitting just three of 14 fairways.

The Victorian, regarded as one of golf's premier putters, also struggled on the greens ranking near the bottom of the field (73rd) for strokes gained in putting.

"Yeah my good shots didn't turn out well but I didn't play good either," Baddeley told AAP after his round.

"I missed too many fairways after driving it really nicely for the first two days and I didn't putt well at all today, which is surprising.

"It was just one of those days, unfortunately. Hopefully I can come out tomorrow and shoot a low one."

Baddeley, though, sits nine spots outside the top 125 on the FedEx Cup points race who qualify for the lucrative playoffs and earn US Tour cards for next season.

He insists there is plenty to play for during Sunday's final round.

"Oh yeah, for sure. I'm going try and have a good day, get in the top 10 and get some (FedEx) points," Baddeley said.

"I've been playing well the past few months, it was just a weird day, so I hope it's windy tomorrow because I know I can make my way back up the leaderboard."

Baddeley was still the best of the three Australians who made the cut with veterans Rod Pampling (75, four under) and Cameron Percy (77, three under) struggling on day three.

Aaron Baddeley is just three shots behind leader Kevin Tway after the second round of the Canadian Open.

The 37-year-old Baddeley made six birdies in a bogey-free 66 at the at Glen Abbey Golf Club in Ontario.

He jumped 12 spots to tied sixth at the halfway mark of the PGA Tour event.

His Australian compatriots Cameron Percy (68) and Rod Pampling (70) booked their weekend spots at eight under and seven under respectively.

Leader Tway had a late wobble with bogey on 17 but his seven-under 65 moved him to 13 under and leader by one from Whee Kim (65) and playing partner Keegan Bradley, who had the day's equal best score of 63.

Incredibly, Bradley closed birdie-eagle-birdie-eagle to be six under in four holes and nine under for the round. He earlier made eagle on the second hole.

"That was wild," Bradley said.

"It turned kind of an average day out here into something really special.

"There's not many courses you can do that on like you can out here.

"That's what makes it such a great event."

Tway is trying to win for the first time on the tour in the event his father - 1986 PGA Championship winner Bob Tway - won 15 years ago at Hamilton for his last victory.

"I talk to dad every day, no matter if I'm home, here," Tway said.

"We talk about every round. He can probably tell you what kind of shots I'm hitting just by like watching on TV.

"He knows what the swing looks like. He's been there throughout, so he's a big key for me."

Johnson Wagner (65) and Korean Byeong Hun An (67) are 11 under in a tie for fourth.

Baddeley is alongside world No.1 Dustin Johnson (66), Zac Blair (67) and Joaquin Niemann (67) at 10 under.

"The golf course is in too good a shape not to have to go low," Johnson said.

"Today was fairly windy but with the greens being receptive you're going to have to attack the golf course and you're going to have to shoot low."

Nick Taylor is the top Canadian after a 67 left him at nine under, in a group which includes first-round leader Robert Garrigus (72).

Two-time defending champion Jhonattan Vegas is five under after a 70.

Sergio Garcia, Bubba Watson and Brooks Koepka missed the cut.

Tiffany Joh holds a three-shot lead after two rounds of the Scottish Ladies Open but Australians Su Oh and Minjee Lee are in the top 10 and poised for a weekend charge.

Oh shot up seven places to tied fifth after a round of five-under 66 on Saturday which included seven birdies and two bogeys.

She sits at eight under, five shots behind Joh.

After making the turn at even- par for the day, world No.11 Lee made eagle on the par-5 11th on her way to a 68 and seven-under total.

Australians Karrie Webb (69) and Sarah Jane Smith (66) at two under, Katherine Kirk (72) at even par and Sarah Kemp (73) one over, also made the cut.

Joh, who is chasing a maiden LPGA Tour victory, carded a four-under 67 to stay in front.

The 31-year-old American made five birdies and one bogey, her first of the week, to register a 13-under aggregate of 129.

US Open champion Ariya Jutanugarn produced a joint best-of-the-day 65 to get within three strokes of the lead on 132, along with Amy Yang (66) of South Korea.

Caroline Masson (65) of Germany was alone in fourth position on 133.

"I had pretty low expectations for today," overnight leader Joh said.

"I probably would have taken anything under par, but on the first hole, right away we made a 45-footer, and I just started laughing.

"I didn't even know what to say. So, yeah, it was a really good start and I guess I just kept rolling with it."

and Katherine Kirk carded rounds of 70 be one under while Karrie Weeb's even-par 71 has her tied for 43rd.

Humble western Sydney golfer Grant Booth is preparing to make his US PGA Tour debut at the Nevada course where he used to caddie for wealthy American golfers.

The Blacktown youngster-turned US college star has a remarkable story.

The 22-year-old spent the past four years caddying at Montreux Golf Club in Reno in his spare time while enjoying a record-breaking college career at the University of Nevada.

But he will now play there for a $US3.4 million purse having received a sponsor's exemption to the US Tour's Barracuda Championship next week - the first given to a University of Nevada player.

Booth believes the biggest advantage of caddying at Montreux is knowing the course, which is perched 5,500 feet above sea level, like the back of his hand.

"It's really the perfect venue for me to debut on the PGA Tour," he told AAP.

"I've certainly seen every inch of the course and that should help settle the nerves."

Since leaving Australia after high school, Booth has become a hometown hero in Reno.

Statistically, he is the best golfer to come through the university, despite the fact former US Tour players Kirk Triplett, Michael Allen and Charlie Wi are alumni.

Booth set Nevada's single-season scoring record (71.64) last year before smashing it by a stroke in his final season this year.

Before graduating in May, Booth earned Nevada's career scoring record (71.86) and guided the Wolfpack team to its first NCAA Regional championship appearance in 11 years.

Booth said he couldn't have asked for a better pathway to the paid ranks.

"Coming to America at a young age makes you grow up quickly," Booth said.

"You toughen up or you don't make it; you're an 18-year-old freshman playing against 22-year-old seniors who are in the top 20 college golfers in America."

Booth is managed by former NRL star Braith Anasta, who was impressed by his "courage to move overseas and back himself at the collegiate level."

"Grant comes from a very humble upbringing in Blacktown; he has had to fight for every inch," Anasta said.

"He is the quintessential Australian athlete who has had to sacrifice a lot and travel overseas to learn from the best."

Booth also paid tribute his mentor, US Tour winner Matt Jones, with who he shares a swing coach in acclaimed Sydney-based teacher Gary Barter.

"Matt is a fantastic guy who has really taken me under his wing over here," Booth said.

"He has brought me out to a few of his PGA Tour events to see how the professionals do it."

Booth caddied for Jones at last year's Barracuda Championship - a modified stableford scoring event which Australians Greg Chalmers (2016) and Geoff Ogilvy (2014) have won.

Veterans Rod Pampling and Cameron Percy made just one bogey between them to be the best-placed Australians after the opening day's play at the weather-affected Canadian Open.

Pampling carded a 67, with six birdies and a bogey, while Percy was five under through 16 holes to be in a group tied for ninth.

Robert Garrigus made a birdie after a rock saved his ball from water and had a one-stroke lead after a nine-under 63 when play at the PGA Tour event was suspended because of dangerous weather.

"Hit it right in the middle of the water, and it hit a rock and bounced over the thing," Garrigus said about the break on the par-5 13th.

The American wasn't as fortunate on Nos. 10 and 17 at rain-softened Glen Abbey.

"Could have been 59 there if a couple putts didn't lip out," Garrigus said.

He made five straight birdies, from the second hole, and birdied four of the last six holes - three of them par 5s.

"I think 20-something-under is going to win, so we'll forget about it when I get home," Garrigus said.

"This was a good day, get to enjoy it for a minute, but I've got to close my mind off."

He played in the morning, well before a more than two-hour delay because of high wind and potential lightning strikes.

Play resumed at 6:44pm and was stopped for the day at 8:04pm.

PGA Tour rookie Adam Schenk was second. He birdied the first five and last three for a 64 to be eight under.

"If you were in the fairway, it was much easier to attack, but you could still play from the rough, so I did that too often today but was fortunate to get away with it," Schenk said.

Chris Stroud is alone in third after a 65 while Englishman Ian Poulter and South Korean Byeong Hun An are in a group tied for fourth at six under.

World no.1 Dustin Johnson's 68 has him in a pack which includes Australian Aaron Baddeley, who is four under through 17 holes.

John Senden signed for an even-par 72 while Matt Jones was one over after a 71 which included an eagle three and a double-bogey seven.

Two-time defending champion Jhonattan Vegas was two under through 16 holes.

Jason Day says his first top-five on the US PGA Tour since last year's Masters is "bittersweet" having let slip yet another chance of securing a Pebble Beach Pro-Am victory.

Day started a breezy final round three shots off the lead but a three-over-par 75 left him in fourth at 11 under - eight shots adrift of Canadian winner Nick Taylor.

Overnight leader Taylor shot 70 to finish at 19 under, for a four-shot victory that gets him into the Masters for the first time, along with the PGA Championship in May.

American Kevin Streelman (68) was second while Phil Mickelson (74) was denied a record sixth title at the event and finished third at 14 under.

Day has now finished in the top-five at Pebble Beach five of the past six years without hosting the trophy on the iconic Monterey Peninsula.

He owns an astonishing seven top-six results in 11 starts at the tournament since 2008.

"I don't know why," Day told AAP when asked why victory at Pebble Beach had eluded him so often.

"It's hard to win here.

"You have to string four really good rounds together and you're battling the elements.

"With that wind today, it was difficult to putt on those greens."

Former world No.1 Day had not managed a top-10 on the US PGA Tour since June and was without a top-five since sharing fifth at Augusta National in April.

His poor stretch of form resulted in him plummeting to world No.46 but his week's work in California lift him to 38th in the rankings.

"It's bittersweet, because I wanted to (win)," Day said.

"But it's still a good step in the right direction.

"You can find negatives in anything, but it's been a while since I've had a top five and it's a great result to have early in the year.

"I played well and it's a positive week."

Day will next tee up at this week's Genesis Invitational hosted by Tiger Woods, after a three-year absence from the event.

The tournament will be held at Los Angeles' famed Riviera Country Club, while it has been reduced to a field of 120 and given invitational status on the US PGA Tour.

"After today, I'm looking forward to getting stuck into next week. I'm playing some good golf," Day said.

Next best of the Australians at Pebble Beach was Matt Jones (72) sharing fifth at nine under.

Aaron Baddeley (75) tied for 25th at four under while Cameron Davis (73, two under) and John Senden (83, five over) rounded out the Aussies contingent that survived the cut.

Unheralded Hee Young Park has come up trumps in an all-Korean playoff to win the $1.5 million women's Vic Open at 13th Beach.

World No.191 Park claimed the biggest victory of her career at the fourth playoff hole when Hye-Jin Choi self-destructed.

Choi's drive off the 18th tee sailed wide right and ended up nestled against a pine cone.

She then hit her third shot into an unplayable lie and was forced to take a one-shot penalty.

Park's regulation par was more than enough for her to claim the victory.

She said she almost gave golf away in 2019 after the worst year of her career before deciding to have another crack.

"I had a chance to play another year this year, so I never stopped," said the 32-year-old.

"I think God just gave to me this present."

Fellow South Korean So Yeon Ryu, a two-time major winner and former world No.1, was eliminated at the second playoff hole.

The trio had all finished the 72-hole tournament at eight-under 281, with Choi the big mover on Sunday with a three-under 69 in difficult windy conditions.

Ryu closed with a 72 and Park had a 73.

Ireland's Leona Maguire and Swede Linnea Strom tied for fourth at 282.

Two-time Vic Open winner Minjee Lee (73), Robyn Choi (71) and fast-finishing Su Oh (68) were the best Australians in a tie for sixth at six-under.

Oh's round of four-under was the lowest of the day.

For once, Minjee Lee had to take a back seat to her younger brother Min Woo Lee, who claimed his first professional victory in the men's Vic Open.

She now shifts her focus to next week's Women's Australian Open at Royal Adelaide.

"To be honest today I don't think I was ever quite there in contention, it was a little up and down," said Minjee Lee, who started the day five shots off the pace.

"The Aussie Open is a big one for me as well, so I'm really excited to go over there.

"I feel like I'm going in with pretty good form so hopefully I can have a good score."

Overnight leader Ayean Cho from South Korea plummeted down the leaderboard after a horror stretch midway through the round when she dropped seven shots in the space of six holes.

The teenager finished in a tie for 16th at three-under after closing with an 81.

Australian Min Woo Lee has claimed family bragging rights and helped create golfing history with his maiden professional victory in the men's Vic Open at 13th Beach.

The 21-year-old emulated the feats of his celebrated older sister, world No.9 Minjee Lee, who won the women's Vic Open at the same Barwon Heads venue in 2014 and 2018.

It means both got their first pro victories at the Vic Open, which features both men's and women's tournaments played concurrently.

Overnight leader Lee finished in style with a closing birdie at the final hole to win by two shots from New Zealander Ryan Fox on Sunday and was embraced by his delighted sister on the 18th green.

"It was nice of her to come on; it was awesome," said Lee.

"The Vic Open, it's a home Open and especially as it's also a European Tour event, it's big.

"With my sister and I winning the same tournament it is pretty special.

"And I've got bragging rights now so it's even better."

The West Australian carded a four-under 68 in strong winds to finish at 19-under 269 while Fox applied some late pressure with a blistering 64.

The win gives the gifted Lee a two-year exemption on the European tour, which co-sanctioned the event, having finishing just two spots shy of keeping his card there in 2019.

"I can pick and choose now on the European Tour and this year I'll be focusing on that," he said.

""I'm looking forward to it.

"It was tough over the last year and a bit, because I had to go and play whenever I got the call-up."

The wind picked up during the afternoon, although conditions were not as brutal as the 60 km/h gusts that hit during Saturday's third round.

"I've given myself nine out of 10 for ball striking this week," said Lee.

"I knew just coming into today that I could just stay calm and just hit every shot the same as the last three days."

He plans to use some of the $183,300 prize money on a new car, meaning he will no longer have to borrow his sister's vehicle when they are back home in Perth.

Minjee Lee was in the frame for a possible third women's Vic Open triumph for much of Sunday's final round, but had to settle for a tie for sixth after closing with a one-over 73.

She considered offering her brother some advice before the final round but decided against it.

"I think he did a fantastic job all week, just taming the wind, not everybody can do it," she said.

""I'm just super proud of him.

"I know he's doing a great job."

Fox's final round of eight-under 64, including two eagles, was three strokes better than anyone else managed on Sunday.

"You're not supposed to shoot 64 on a day like today but I'll certainly take it," said Fox, the son of former All Blacks rugby great Grant Fox.

Australians Marcus Fraser and Travis Smyth and Frenchman Robin Sciot-Siegrist tied for third at 14-under.

Northern Irishman Graeme McDowell has shot a steady even-par 70 to win the Saudi International by two strokes for his first European Tour title since 2014.

McDowell, the 2010 US Open winner at windy Pebble Beach, protected his lead on a breezy Sunday afternoon by the Red Sea to card a 12-under 268 total, holding off late pressure by defending champion Dustin Johnson.

Johnson made an eagle on the par-5 18th by chipping in over a bunker for a three-under 67 as McDowell saved par on the 17th.

McDowell sank his five-footer to par the 18th and secure his 16th professional win, in a 13th different country.

A first title on McDowell's home tour since the 2014 French Open lifted him back into a top-50, and earned a winner's check of $US583,000 ($A870,929).

"It's tough to win on a course that doesn't fit your eye but this is a sweet one," McDowell said while fighting back tears on Sky Sports.

"If my kids are watching at home I love you guys, and my wife obviously. I can't wait to get home and see them."

The 40-year-old Northern Irishman said his big goal this year was to be back in the top 50, and it come a little faster than he had expected.

"The game of golf is in such great shape, so many great players, it's so exciting to be a top player in the world and I want to be back up there again.

Phil Mickelson fired a 67 to end in a three-way tie for third place on nine-under, with Thomas Pieters (65) and Gavin Green (70).

McDowell's partner in the final pairing, Victor Dubuisson, fell away after dropping five shots from holes 10-14 in a four-over 74. The Frenchman was among five players tied for sixth place on seven-under, including Sergio Garcia (66).

Top-ranked Brooks Koepka carded a two-over 72, including a double-bogey on the ninth. He finished tied for 17th place, eight shots back.

Australian Lucas Herbert, who claimed his maiden European Tour victory at last week's Dubai Desert Classic, finished 10 shots off the pace in equal 27th.

His final round was an error-laden two-under 68.

Fellow Australian Maverick Antcliff made par in his closing round to finish one-over overall in equal 44th.