The 26 year old finished one ahead of South Africa's Louis Oosthuizen.
Spain's Jon Rahm claimed his first major after finishing with back-to-back birdies on the final day of the US Open at Torrey Pines.
The 26-year-old ended up on 6 under par, one ahead of South Africa's Louis Oosthuizen.
Rory McIlroy - who had a share of the lead at one stage - finished in a share of 7th place on 1 under par.
While Shane Lowry finished back on 13 over.
Rahm says the quality of players at the top of the leaderboard brought the best out of him:
Elsewhere,
Leona Maguire narrowly missed out on her first win on the LPGA Tour last night.
The Cavan golfer finished second at the Meijer Classic in Michigan.
World number four Nelly Korda won on 25-under-par, with Maguire just two shots back.
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