MEXICO CITY — Patrick Reed made it hard for anyone to question his moxie.

A week that began with Brooks Koepka saying he thought Reed cheated when he was penalized for swiping sand in the Bahamas ended with Reed delivering clutch moments down the stretch Sunday to win the Mexico Championship.

Then again, Reed always seems to be at his best when it feels as though the world is against him.

Two shots behind with four holes to play, Reed ran off three straight birdies to overtake a faltering Bryson DeChambeau, closing with a 4-under 67 for his second World Golf Championships title.

Reed made it interesting in the end with a wild tee shot into the trees on the 18th hole at Chapultepec Golf Club, forcing him to chip back to the fairway. He had to two-putt from 35 feet for eighth victory of his PGA Tour career.

In a wild final round in which five players had a share of the lead — and four were tied heading for the back nine — DeChambeau appeared to seize control with five birdies in a six-hole stretch starting at No. 9.