Dustin Johnson carded an eight-under-par 64 to take a one-shot lead at the Memorial Tournament on Thursday.
Johnson is closely followed by Brendan Steele, who sits in second place on the leaderboard after firing a seven-under-par 65.
World number one Jason Day is in a tie for third on six-under with Danny Lee, Matt Kuchar and David Hearn.
Meanwhile, world number two Jordan Spieth is six strokes adrift of the lead in a tie for 44th, while Rory McIlroy is in a tie for 58th on one-under.
Johnson, who finished in a tie for 12th at the AT&T Byron Nelson last month, began his campaign with a hat-trick of birdies from the first to third before faltering at the sixth, where he made a bogey. He atoned for his mistake as he followed it up with a trio of birdies from the seventh to ninth.
Johnson maintained his form heading into the back nine as he made four consecutive birdies from the 12th to 15th, which included a 32-foot putt at the 13th. He was unable to end his round on a bright note though as he made his second bogey after missing a seven-foot par putt at the 17th.
Steele got off to a sensational start as he made a 29-foot birdie putt at the second before proceeding to record four successive birdies from the fourth to seventh. He had a much more turbulent back nine as he made three birdies, a bogey, a double bogey at the par-four 14th and an eagle at the par-four 18th, where he sunk his approach shot from 154 yards.
Day, who won The Players Championship last month, continued his brilliant run of form on Thursday as he registered a 66, during which he made three birdies and a bogey on the front nine. The Australian began the back nine with a trio of birdies from the 11th to 13th before making a bogey at the 14th. He atoned for his mistake with a seven-foot eagle putt at the par-five 15th.
Spieth, who hit a 70, did not get off to the best of starts as he made two birdies and a bogey on his front nine. The American seemed to be turning his fortunes around on his back nine as he made three birdies after recording a bogey at the first. However, he let himself down with a bogey at the ninth, where he missed a nine-foot par putt.
McIlroy struggled during his round of 71 on Thursday as his front nine consisted of two birdies, a bogey and a double bogey at the par-three 16th. The Ulsterman fared a lot better on his back nine though as he made four birdies and two bogeys.
Scotland’s Connor Syme and Englishman Matthew Jordan were also part of the successful quintet.
The English Open has been revived as part of the new schedule.
Close House Golf Club, near Newcastle, will host the British Masters on July 22.
The event was last staged in 2002.
The tournament at Close House, scheduled to start on July 30, is set to be the first European Tour event since the coronavirus crisis halted action.
The world number one believes it would be the ‘right call’ to push the event back to 2021.
The exhibition match, against Phil Mickelson and Tom Brady, raised 20 million dollars.
The Dutchman finished third and second in the first two weeks of the home-based competition.
NFL stars Tom Brady and Peyton Manning will also be involved.