400-1 shot, amateur Nick Dunlap makes history by winning American Express

Dunlap got up and down for par at the 72nd hole at the PGA West Pete Dye Stadium Course to shoot 2-under 70 for the round and 29-under 259 for the week, one ahead of South Africa's Christiaan Bezuidenhout.

Dunlap was listed at 400-1 to win prior to the tournament. According to The Action Network, Dunlap was +40000 at some sportsbooks, and +35000 to win outright at Bet365. 

The reigning U.S. Amateur champion and sophomore at Alabama opened 64-65-60, having racked up 10 birdies and an eagle to shoot 12 under at La Quinta Country Club in Saturday's third round.

He began Sunday with a three-shot lead over Sam Burns but found the water on the par-4 seventh hole and made double bogey. Dunlap responded with birdies at Nos. 8 and 14, and after chipping to 10 1/2 feet at the par-5 16th, he sank a birdie putt to tie Burns at 29 under.

Dunlap then landed his tee shot at the par-3 17th on the island green and Burns proceeded to find the water.

Dunlap made par but hit his tee shot at No. 18 landed on a mound far right of the fairway. After Burns found the water for the second straight hole, Dunlap's second shot traveled 194 yards and rolled down a mound into a far corner of the fairway, setting up another remarkable chip to 6 feet.

Bezuidenhout eagled the par-4 15th and birdied the 18th to polish off a bogey-free 65 and make Dunlap's final par necessary to avoid a playoff.