Joaquin Niemann started strongest at the Genesis Invitational with an opening round of 63 on Thursday.
A round of nine birdies gave the Chilean a three-shot lead at the Riviera Country Club in Pacific Palisades, California.
Niemann is the ninth player to open with a 63 on the course. Four of the previous eight players went on to win.
Four Americans ended the first day in a tie for second, including Jordan Spieth, while 2021 Open champion Collin Morikawa is a stroke further back.
World number one Jon Rahm, Tony Finau and Xander Schauffele all carded 69 for their opening rounds, as did Rory McIlroy, who dropped shots on the eighth and 13th holes.
Dustin Johnson finished with a two-over-par 73, while Patrick Reed endured a disappointing first day, a double bogey on the 13th resulting in a six-over-par finish.
"Sometimes I think about a score," Niemann said. "Today I was hitting it so good, I had fun just getting into the shot. I didn't really think of the score.
"But then on 18 I was thinking about [it]. I wanted to make birdie so bad. I wanted to make one more.
"You always work to have these kind of days. You always know that you're never going to have these days four days in a row. It's a good way to start.
"I know it's going to be different days during the week, so I've got to be ready for everything and have the best attitude for it."
Napoli 2-2 Roma: Late Abraham header denies wasteful hosts
A wasteful Napoli were held to a 2-2 draw at home by Roma in Serie A, with a late Tammy Abraham header securing a point for the visitors.
The visitors took the lead from the penalty spot a minute before the hour mark, with Paulo Dybala converting after Juan Jesus fouled Sardar Amzoun.
However, Napoli equalised six minutes later through Matias Olivera's deflected shot, and completed the turnaround with their own penalty six minutes from time as Victor Osimhen tucked away after Khvicha Kvaratskhelia was felled by Renato Sanches.
The hosts could not hold on, though, and were pegged back with two minutes to go. Substitute Abraham's header from a corner was eventually awarded following a VAR review after he had initially been ruled offside.
Data debrief
Napoli remain eighth in the Serie A table on 50 points, the exact amount they had registered after their opening 19 games of last season.
Though his penalty was not enough to earn Roma victory, Dybala continued his impressive start to 2024, during which he has been involved in the joint-most goals in Serie A with 12 (nine goals, three assists).
Lyon are through to their 11th Women's Champions League final after sealing a 5-3 aggregate victory over compatriots Paris Saint-Germain.
The record eight-time winners scored three times in the final 10 minutes of last week's first leg to take a narrow 3-2 lead into the return fixture at Parc des Princes.
However, they were quicker out of the blocks in the second leg, with just three minutes on the clock when Selma Bacha drilled home from range for her first Champions League strike in five-and-a-half years.
Tabitha Chawinga responded before the break to reduce PSG's aggregate deficit to a single goal, but Melchie Dumornay put the tie beyond doubt nine minutes from time, as Sonia Bompastor's side set up a final showdown with Barcelona on May 25.
Data debrief
Lyon continued their dominance over PSG in Champions League semi-final encounters, having now progressed from each of their last four such ties.
The eight-time champions lost their first two semi-finals they contested in this competition, but have now won each of the last 10, and will seek a record-extending ninth title in Bilbao next month.
Alcaraz's pursuit for third straight Madrid Open crown continues by defeating Seyboth Wild
Carlos Alcaraz boosted his hopes of a third straight Madrid Open title as he comfortably beat Thiago Seyboth Wild to reach the fourth round on Sunday.
Back in his home country of Spain, Alcaraz eased to a 6-3 6-3 triumph to set up a fourth-round clash with Jan-Lennard Struff, whom he beat in last year's final.
The first six games of the opening set went to serve, but Alcaraz found a crucial break in the seventh and ninth games of the set to put him in pole position for victory, a lead he would not relinquish as he overcame being broken in the seventh game of the second set to seal his safe progression.
Holger Rune was a surprise casualty as the world number 12 was defeated 6-4 4-6 6-3 by Tallon Griekspoor, though world number eight Andrey Rublev eased through with a straight-sets win over Alejandro Davidovich Fokina.
Data debrief
With his triumph over Seyboth Wild at the Madrid Open, Alcaraz has now won 93.3 per cent of his games at the tournament. That is the highest win percentage of any player with at least 10 games played in a single ATP-1000 event since the format was introduced in 1990.
Against Seyboth Wild, Alcaraz won 27 of his 31 first-serve points, also recording 19 winners to his opponent's 10 as he dominated the contest on his way to victory.
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