Kurt Kitayama managed four straight birdies on his back nine to claim the lead ahead of Daniel Berger in a group of three after the opening day of the Honda Classic in Florida on Thursday.
The little-known American carded a six-under-round of 64, starting the day with three straight birdies, before his hot run on his back nine at Palm Beach Gardens.
Kitayama has enjoyed a good recent period, making the cut at his past five starts before Thursday's impressive feat as solo leader.
"I think when you're struggling, I think just that self-motivation to find keep getting better and finding a way to figure it out, it's kind of how you've got to keep going," Kitayama told reporters.
The 29-year-old leads by one stroke from Rory Sabbatini, Chris Kirk and hometown hero Berger who are five-under.
World number 20 Berger started his round brilliantly, with three birdies on his first four holes, while he also sunk a 28-foot birdie putt on the ninth hole with no ill-effects from a back problem that has been plaguing him lately.
Slovakian veteran Sabbatini made birdie on the 18th to jump into a share of second, with Kirk having eight birdies and three bogeys in an entertaining round.
Danny Willett, Matthias Schwab, Andrew Kozan, Aaron Rai and Peter Uihlein are all next tied for fifth at three under.
Four-time major winner and current world number 15 Brooks Koepka managed three birdies in his round of two-under-68 to be four shots off the pace.
Last week's Genesis Invitational winner Joaquin Niemann had an even round of 70, despite leading early after four birdies on his front nine, with a double bogey holding him up on the fourth hole.
Pre-tournament favourite Louis Oosthuizen will battle to make the cut after five bogeys on the front nine before a double bogey on the 17th hole left him with a five-over-75.
Scheffler swinging with confidence at Tour Championship despite seeing lead cut to four
Scottie Scheffler insists his swing is "in a good spot" despite seeing his lead at the top of the Tour Championship standings cut to four shots on the second day.
Scheffler, who is aiming to win his first FedEx Cup title, carded 65 in his opening round and entered the second round with a 10-shot lead.
However, the world number one saw American duo Collin Morikawa and Xander Schauffele close the gap during a weather-disrupted second round on Friday.
Scheffler carded a round of 66 to take himself to 21 under par, aided by two birdies in the final three holes to keep the chasing back at bay.
"I feel like my swing is in a good spot, and I've hit it nice the last couple of days," he said. "A lot of quality stuff out there, and in a good spot going into the weekend."
Morikawa is four shots off the pace after producing a superb eight-under 63, which was the best round of the day, and has surged up the standings to second place.
In an impressive round, he dropped just one shot on the 11th hole, but made amends on the back nine before closing with back-to-back birdies.
"He's going to continue to make birdies," Morikawa said about the possibility of catching Scheffler. "He's driving it really, really well here, and you're giving yourself enough wedges to make some scoring opportunities out there.
"For me, it's just about bringing energy and just staying alive out there."
Schauffele is in third, one shot behind compatriot Morikawa, after shooting an impressive second-round 64 to remain in the hunt for the $25million prize money.
There is then a four-shot gap until a group of three players, including Adam Scott, are tied for fourth place at 12 under, while Rory McIlroy is tied for 10th place on eight under.
'Still feel like I've got a chance', says McIlroy as Scheffler takes Tour Championship lead
Scottie Scheffler is in prime position to win his first FedEx Cup title after storming into a seven-shot lead at the Tour Championship.
The world number one, who started on 10 under due to the FedEx Cup's staggered structure, carded a superb 65 in the first round of the PGA Tour's season-ending tournament, after recovering from an early bogey at East Lake.
Scheffler's haul included seven birdies, with five of those coming from his last seven holes, as he bids to win a seventh PGA Tour event of the season.
His main FedEx Cup challenger Xander Schauffele is tied for second on nine under par, along with Collin Morikawa, while Rory McIlroy is three shots back in T10.
However, the Northern Irishman has not given up hope of applying pressure to Scheffler as the tournament goes on.
"I'm happy with how I hung in there and had a good finish," McIlroy told Sky Sports.
"When I saw Scottie had gotten to 14, I was like, 'Oh, got to try to just hang on to the coattails a little bit'.
"Still feel like I've got a chance, and it was nice to finish the way I did."
Scheffler, also speaking to Sky Sports, said: "Yeah, I'm pleased with the day.
"I tried not to think about any sort of lead or anything like that, my job was to go out there and execute and I felt like I did a really good job of that. I felt like I was doing some good stuff to start the day.
"I had the bogey on one but after that I felt like I played some really good golf."
Bradley in disbelief after moving into FedEx Cup contention with BMW Championship win
Keegan Bradley was in disbelief after putting himself in FedEx Cup contention by winning his second BMW Championship title on Sunday.
Bradley, who was appointed as the United States' 2025 Ryder Cup captain last month, edged out Adam Scott to claim a one-shot victory at the event near Denver.
Scott pulled level with Bradley at the start of his final round but later bogeyed three straight holes as the American won his seventh PGA Tour title.
Bradley, who also won the 2018 tournament by beating Justin Rose in a play-off, now sits fourth in the FedEx Cup standings, behind Scottie Scheffler, Xander Schauffele and Hideki Matsuyama.
Following his victory, the 38-year-old set his sights on another triumph at next week's Tour Championship in Atlanta, having only just squeezed into the 50-player field at Castle Pines.
"Oh, man, it just shows why you've got to grind it out every week because you never know how fast it can switch," Bradley said.
"Now I go to Atlanta with a chance to win the FedEx Cup. I can't believe it. I'm so excited.
"I'm in a bit of a state of shock because there was a time a week ago about this time that I didn't think I was going to be coming here.
"I had to have a lot of magical things happen for me to just play in this tournament, and when I got here, I was so grateful just to be here.
"I played with a real sense of calm all week, which is not the norm for me"
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