It got ugly down the stretch at Muirfield Village.
Bubba Watson made a seven on the 15th hole, eventually finishing one stroke behind Kevin Na and Hideki Matsuyama, who tied at 13 under.
Adam Scott, also in contention, made three straight bogeys from the 14th through the 16th holes Sunday to finish three strokes behind Matsuyama and Na.
Even eventual winner Matsuyama double-bogeyed the par-three 16th hole and needed a birdie at the 18th to get into a playoff with Kevin Na, whose final-round 64 hours before had him waiting in the clubhouse to see if his score would hold up.
Even weirder, Matsuyama snapped the head off his driver on the 18th hole when he casually slammed it against the turf after a poor tee shot. Choosing not to replace the driver for the playoff (as he would have been permitted to do per the Rules of Golf), Matsuyama hit a poor tee shot with his 3-wood and found a fairway bunker off the tee.
When Kevin Na inexplicably pulled his tee shot into a water hazard seconds later, he effectively handed the 22-year-old the first PGA Tour win of his young career, ending the brief, baffling playoff after just one hole.