The American joined Tiger Woods, Jack Nicklaus, Jordan Spieth and Rory McIlroy in the select group of players who won two majors before turning 25.
The last two U.S. Open winners are both 1 over par after the first round at Royal St. George's, along with defending champion Shane Lowry. Thomas is 2 over par.
Louis Oosthuizen leads the way at Royal St. George, with Jordan Spieth and Brian Harman a shot further back.
World No. 1 Jon Rahm is the bookmakers' favorite as he looks to win a second consecutive major.
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World number one Brooks Koepka finished at 3-under par on Thursday and is a 7/2 favorite to win at Portrush this weekend.
Woods' hopes of winning a fourth Claret Jug lay in tatters after he shot a 7-over par 78 in the first round at Portrush.
The 148th edition of the oldest golf major in the world gets underway on Thursday at Royal Portrush Golf Club in Northern Ireland.
The 15-time major winner begins the first round of the Open Championship at 10:10 a.m. ET alongside 2018 Masters winner Patrick Reed.
Weather is expected to play a major role over the next four days as the Open Championship returns to Northern Ireland.
The three-time Open champion hasn't played since the U.S. Open last month, but remains confident about his chances.
Henrik Stenson, Matt Kuchar and Patrick Cantlay could all spring a surprise at The Open this weekend.
The final major of the season gets underway on Thursday at Royal Portrush Golf Club in Northern Ireland.
The 148th edition of golf's oldest major takes place in Northern Ireland this weekend for only the second time since 1951.
Woods will play alongside Ryder Cup teammate Patrick Reed in the first two rounds of The Open at Portrush.
Rory McIlroy and Brooks Koepka are the pre-tournament favorites at 8/1, while Tiger Woods is a 16/1 outsider.
The final major of the season returns to Northern Ireland for the first time in 68 years and local favorite Rory McIlroy is the man to beat.
Erin Hills is "like a links golf course on steroids," Spain's Jon Rahm has said.
Garcia took his first major victory at his 74th attempt.
Garcia has had a long history of near misses.
Nicklaus won 18 major golf championships.
The Swede won his first major at the British Open on Sunday.
Welcome to this joyous spectacle of suffering! No one will leave Royal Troon unscathed, even the victor.