World number one amateur Patrick Cantlay has turned professional and is now a stablemate of Tiger Woods - but his decision means he is no longer exempt for next month's Open Championship.
The 20-year-old American plays for money for the first time in this week's Travelers Championship, where his second round 60 last year was the lowest score ever recorded by an amateur in a PGA Tour event.
Cantlay was given a place at Royal Lytham because of his amateur ranking at the end of last season, but had to stay amateur to take it up.
"I have a tremendous passion and respect for the game of golf and can't wait for the challenge of taking my game to the next level," he said on signing for Excel Sports Management, whose agent Mark Steinberg has represented Woods throughout his career.
Cantlay has made the cut in the last two US Opens, finishing 21st and 41st, and was 47th at The Masters this April. He also had a ninth place finish at last year's Canadian Open and was part of the American Walker Cup side in Aberdeen last September.
He had been at the top of the rankings for the past 54 weeks and lost in the final of the US Amateur last August to Walker Cup team-mate Kelly Kraft, who turned professional after playing at Augusta two months ago and as a result lost his Open Championship spot.