Brooks Koepka said his game was just where he wanted it to be ahead of the US PGA Championship.

Koepka fell short in his title defence at the WGC-FedEx St. Jude Invitational, finishing in a four-way tie for second three shots behind champion Justin Thomas.

It marked the American's best result of the year and just his second top-10 finish in 11 events.

That has left Koepka optimistic ahead of the US PGA Championship, where he will be aiming for a third straight success starting on Thursday.

"I feel good. I feel like my game is right there, this is where we wanted to be, peaking for the PGA," he told Golf Channel.

"I feel like my game is right there, everything's solid, I hit a lot of good putts today, just didn't go in. I'm pleased with it."

Koepka said he was pleased with his improvement ahead of the first major of the year.

"I feel like I'm playing good so I'm excited to tee it up," he said.

"Everything's moving in the right direction so, once you know you lose, it doesn't matter if you lose by one or 10, it doesn't matter so, pleased with it, moving in the right direction and looking forward to next week."

Justin Thomas said learning from his mistakes was key to his WGC-FedEx St. Jude Invitational victory.

Thomas carded a five-under 65 to earn a three-stroke win in Memphis on Sunday, securing his third PGA Tour success of the season.

The American also moved top of the world rankings as he continued his strong form in 2020.

Thomas said he learnt plenty ahead of his victory, particularly at the Workday Charity Open, where he gave up a three-stroke lead before losing to Collin Morikawa in a play-off last month.

"It was a hard-fought day, but it meant a lot," he told the Golf Channel.

"I felt like how we did it, being four behind to start the day, I haven't exactly played well coming from behind in the past. I felt like I learnt a lot from that, especially Colonial.

"I just didn't handle it well and I pressed way too hard and I definitely learnt a lot from Workday in Columbus, just how I handled that lead and that situation the last couple of holes. I did obviously a very poor job, but because of that I felt a lot more calm and stayed more in the moment today."

Top of the world rankings, Thomas is also on top of the FedEx Cup standings.

The 27-year-old said he still had room for improvement ahead of the US PGA Championship starting on Thursday.

"It was really important, but at the end of the day if you don't play well in the play-offs, it's hard to win a FedEx Cup, especially in Atlanta," Thomas said.

"Right now, I'm obviously very happy and elated that we got it done today but I need to work on some things and get ready for the PGA next week and try and win another major."

Justin Thomas held off a threat from defending champion Brooks Koepka to win the WGC-FedEx St. Jude Invitational and claim the number one ranking.

Thomas carded a five-under-par 65 in Sunday's final round to soar to the top of the leaderboard and he stayed there for his third title of the season – the most on the PGA Tour.

Former world number one and 2018 champion Thomas was four shots off the pace when he teed off on day four at TPC Southwind, where Brendon Todd was the player to beat overnight in Memphis, Tennessee.

But Todd could only manage a fourth-round 75 and a share of 15th as Thomas – fuelled by a flawless front nine – used six birdies and a solitary bogey to clinch his 13th career crown at 13 under.

The result means Jon Rahm's brief stint atop the world golf rankings is over, with the Spaniard (66) replaced by Thomas after languishing in a tie for 52nd ahead of the US PGA Championship, which starts in San Francisco on Thursday.

Koepka – eyeing back-to-back successes at the tournament – was within one stroke of the lead but the four-time major champion double-bogeyed the last to sign for a 69, having also bogeyed the 16th.

The US PGA Championship holder ended the World Golf Championships event tied for second alongside Phil Mickelson (67), Daniel Berger (65) and Tom Lewis (66).

Xander Schauffele (66), Jason Day (67), Shane Lowry (67), Chez Reavie (68), Louis Oosthuizen (68) and Matt Fitzpatrick (68) finished four strokes behind Thomas, while Dustin Johnson (67), Webb Simpson (68) and Byeong Hun An (73) were a shut further back.

It was another tough outing for Jordan Spieth – the three-time major winner still searching for his first top-10 performance since the Charles Schwab Challenge.

A final-round 71, consisting of two double bogeys, two bogeys and five birdies, saw Spieth slide to four under and nine strokes adrift.

Another former world number one, Rory McIlroy, did not fare much better after finishing tied for 47th following his three-under-par 67.

Brendon Todd will take a one-shot lead from Byeong Hun An into the final round of a stacked WGC-FedEX St. Jude Invitational, with Rickie Fowler, Brooks Koepka and Justin Thomas in the hunt.

Scores of 64 and 65 over the first two rounds saw Todd lead the way by two shots at the halfway stage but a mixed one-under 69 on Saturday left him at 12 under for the tournament and allowed the chasing pack to close in.

Todd, who won back-to-back titles in November after a five-year trophy drought, was one under through the first nine and stayed that way after mixing three birdies with as many bogeys on the way home.

Byeong made double bogey at the par-three 11th to fall back to level par for his round but a streak of four birdies from the 13th to the 16th saw him sign for a 66 and left him just a shot back.

Fowler was flying after going out in 32, only for bogeys at the 12th and 17th to check his progress and leave him at two back on 10 under.

Koepka toiled early in his round as a double bogey at the second and another dropped shot at six saw him fighting to remain among the leaders.

But in typical fashion, defending champion Koepka made six birdies from the ninth to the 16th hole.

A bogey at 17 derailed his momentum slightly but at three shots back Koepka is well in contention heading in Sunday.

Thomas' 66 means he is four shots back, the former world number one going four under on the back nine – including three straight birdies from the 15th to the 17th.

Phil Mickelson, Matt Fitzpatrick, Louis Oosthuizen and Chez Reavie are all five shots back.

Brooks Koepka lamented his putting after struggling to a one-over 71 at the WGC-FedEx St. Jude Invitational on Friday.

The overnight leader dropped to a tie for third, four shots adrift of Brendon Todd (65) at the halfway mark of the PGA Tour event in Memphis.

Koepka rued his performance with the putter in the second round, in which he mixed three birdies with two bogeys and a double bogey.

"I just putted bad. It wasn't really anything other than that. Felt stress-free other than just missing some short ones," the American defending champion said.

"On the back nine they felt good, they were just missing, and on the front they just weren't good putts."

Koepka added: "I felt like I did everything we were trying to do, just wasn't working, wasn't seeing the line.

"Even yesterday I said I didn't feel quite comfortable over anything inside five feet and today it just felt kind of the same."

Koepka is tied for third with Chez Reavie and Byeong Hun An, two shots behind Rickie Fowler and four adrift of Todd.

Brendon Todd held a two-shot lead heading into the weekend at the WGC-FedEx St. Jude Invitational after defending champion Brooks Koepka faltered following a stunning opening round.

Play for round two was brought forward and the field went out in threes on Friday due to the threat of inclement weather in Memphis, and Todd led the way through 36 holes at 11 under after shooting a fine bogey-free 65.

Todd, who won back-to-back tournaments in November after a five-year trophy drought, picked up two shots on the way out and three more on the way home – sinking brilliant birdie putts at the 14th and 15th.

Koepka, who will defend his US PGA Championship next week, had started this tournament with a 62 to match his career-low score on the PGA Tour.

The former world number one started round two on the back nine and was ticking along nicely as birdies at his second and ninth hole moved him to 10 under.

But a double bogey immediately after the turn coupled with two more dropped shots either side of a birdie at the sixth – his 15th – saw him sign for a one-over 71, leaving him four back of Todd.

Rickie Fowler finished birdie-birdie to get within two of Todd after a 67 on Friday, with An Byeong-hun and Chez Reavie in a tie for third with Koepka.

Rory McIlroy recovered from an opening-round 73 with a four-under 66 but stood 10 shots off the pace, while world number one Jon Rahm was four over and Justin Thomas (-4) and Dustin Johnson (-3) each had significant ground to make up.

Brooks Koepka believes he will turn his form around despite still being troubled by a knee injury.

Koepka, the world number six, has missed two cuts in his past three events heading into the WGC-FedEx St. Jude Invitational.

The four-time major champion is confident he can recapture his best form, having recorded just one top-10 finish in 10 events this year.

"It's definitely been frustrating. It will test you mentally, but at the same time, I'm looking at it as a challenge and something where I know it will turn around eventually. It's going to turn around," Koepka told a news conference.

"You don't work that hard for nothing. Starting to see signs of it. Now it's just about going and doing it.

"Whether it be this week, next week, a month from now, two months from now, whatever it's going to be, it will pay off."

Koepka suffered a torn patella tendon in his knee last year and is still being bothered by the injury.

The American said he would finish the season before considering his options.

"The tear has to be worse to go under the knife, but we'll see how it goes," Koepka said.

"We'll see when my season ends and go get stem cell again most likely and figure it out from there."

Rory McIlroy believes playing the WGC-FedEx St. Jude Invitational is the perfect preparation for the US PGA Championship.

The world number two is competing at TPC Southwind starting Thursday, as players prepare for the first major of the year – the US PGA.

McIlroy, who is without a top-10 finish since the PGA Tour season restarted last month, feels playing in Memphis is the ideal preparation.

"I don't think I've ever went and played a PGA Championship site beforehand, and obviously I'm not going to do it this year, obviously here," the Northern Irishman told a news conference.

"It's nice. It sort of feels like it's back to the old days where we played Akron and then went straight to the PGA Championship. I always enjoyed those two weeks. I did well, I did well going that way so sort of reminds me back when we did that.

"I don't think I'm approaching it any differently. Obviously, it is going to be different. You're not going to have fans and atmosphere is not going to be what we're used to at a major championship, but it's a major championship venue.

"It's a great golf course, obviously a really strong field, and I don't think there's any better way to get prepared than to play here this week."

Fans are not permitted at PGA Tour events for the rest of the 2019-20 season amid the coronavirus pandemic.

McIlroy said he was unsure when he would be comfortable with spectators being allowed back at tournaments.

"I guess when there's less of a chance of people getting sick," he said.

"And whether that's [that] they discover more with the virus or there's different treatments, whether that's a vaccine or other treatments. I don't know.

"Again, like being out here, I feel pretty safe. We get tested multiple times a week, and inside the bubble … obviously you can limit your exposure as much as you can. But yeah, it's hard.

"I don't know, I don't know. Whether it's a vaccination or whether it's something happens where there's a breakthrough and we know a little bit more about what's going on with the virus, but I probably can't give you a definitive answer about when I would be comfortable with crowds again."

There will be no fans present at PGA Tour events for the rest of the current season due to the coronavirus crisis.

The PGA Tour confirmed on Monday they had made the decision impacting the remaining events on the 2019-20 schedule "out of an abundance of caution".

"As we have said from the start, our number one priority remains the health and safety of everyone in the communities where we are invited guests each week," said PGA Tour Chief Tournaments and Competitions Officer Andy Pazder.

This week's Memorial tournament in Ohio, which will involve Tiger Woods, was supposed to be the first event with spectators present, but those plans were scrapped earlier this month.

It will now be played behind closed doors, as was the case with the five events played since the Tour's resumption in June.

The US PGA Championship major and the WGC-FedEx St. Jude Invitational have also been among the tournaments to announce they will take place without spectators present.

As a result of the Tour’s latest update, no fans will be able to attend events like the Wyndham Championship and the trio of tournaments in the FedExCup playoffs.

The 2020-21 season will begin with the Safeway Open in California on September 10.

No decisions have been reached on events from then on, with the rescheduled Masters and U.S. Open, which are run independently and fall into next season's calendar, yet to decide on fan attendance.

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