Jason Day misses four-foot putt to lose AT&T Byron Nelson to Billy Horschel

Published May. 21, 2017 7:15 p.m. ET

Nick Schwartz

Sunday's AT&T Byron Nelson came to a close in shocking fashion Sunday in Texas, as a former World No. 1 missed a short putt that would have extended a playoff, handing the tournament to Billy Horschel.

At the site of his very first PGA Tour win (back in 2010), Jason Day was in contention for seemingly the first time all season, and hit a magical chip-in on the 15th hole to give himself a one-shot lead.

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His final group partner Billy Horschel answered with a birdie on the par-5 16th to gain a share of the lead, but looked shaky over his final few holes, with a wide miss into the 18th green that robbed him of any realistic birdie chance.

James Hahn, two shots behind the leaders on 18, came within half an inch of holing out his approach for eagle to tie, and had to settle for a birdie that put him in solo third place.

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Horschel and Day both missed their birdie chances at 18 well left of the hole, and each player tapped in their pars to take the tournament to a playoff.

Playing the 18th hole a second consecutive time, both Day and Horschel left themselves long birdie putts after missing the fairway with their drives. Day very nearly holed out a 48-footer, but hit the ball with slightly too much pace, giving himself a four-foot par putt. Horschel responded by hitting his 17-footer into tap-in range, forcing Day to hole out in order to extend the playoff. Everyone, including Horschel, expected the former No. 1 to make it.

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Day's putt, unfortunately, never had much of a chance. It slipped past the left side of the hole, and Horschel commiserated with Day by telling him he didn't want to win "like this."

The surprise victory was Horschel's fourth career PGA Tour title, and the first since 2014.