(AP Photo/Nam Y. Huh)

MEDINAH, Ill. (AP) Staked to a six-shot lead, Justin Thomas spent more time Sunday worrying about what could go wrong than ending 12 months without winning.

And right when it started to go wrong, Thomas delivered his biggest shots in the BMW Championship.

In a span of three holes around the turn at Medinah, his six-shot lead shrunk to two. Thomas answered with two clutch wedge shots, two big putts and sailed to a 4-under 68 to secure a three-shot victory over Patrick Cantlay, who gave him a battle to the end with a 65.

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