American Jackson Koivun, the world's top-ranked amateur golfer, said Friday he will turn professional after competing in next week's US Open.

Koivun will play in next week’s U.S. Open at Shinnecock Hills Golf Club as an amateur and will make his professional debut at the PGA Tour’s John Deere Classic.

American Jackson Koivun, the world's top-ranked amateur golfer, said Friday he will turn professional after competing in next week's US Open.