Rory McIlroy had to make do with third at the BMW Championship.
A one-under-par final round of 69 moved the six-time major winner on to 13-under on Sunday.
Wyndham Clark held on to claim the title in Missouri.
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The U.S. Open champion secured first place with a score of 17-under-par.
Next up on the PGA Tour is the Tour Championship from East Lake, which will get underway on Thursday.
