IRVING, Texas _ Jason Day picked the worst possible time for his only three-putt green of tournament week at the AT&T Byron Nelson.
Day, the No. 4 player in the world golf rankings, completed all 72 holes of regulation without a three-putt but posted one on his first playoff hole to open the door to a Nelson triumph by Billy Horschel.
Horschel sealed the deal with a closing par on the playoff hole (No. 18), securing his fourth career triumph as a PGA Tour competitor in the tournament's final competitive round at the Four Seasons Resort.
Horschel, who had missed the cut in his only previous Nelson appearances before this season (2011, 2012), became the 35th, and final, Nelson champion crowned in Irving before the event shifts next season to Trinity Forest Golf Club in Dallas.
He also became the 14th golfer in 35 years to prevail in a Nelson playoff at the TPC Las Colinas, a course that has produced the highest playoff percentage of any PGA Tour venue (40 percent) in that stretch.
Horschel secured the $1.35 million winner's check with a routine par on the playoff hole, leaving a 36-foot birdie putt roughly two inches short before tapping in for the stroke that sealed his win. Day, who faced a 48-foot birdie putt at the 18th green during the playoff, sent his birdie effort 4 feet past the hole and pulled the comeback attempt for par left of the cup.
Horschel, 30, will have a chance to complete a DFW double when he makes his Colonial debut at next week's Dean & DeLuca Invitational in Fort Worth.
