MARANA, Ariz. -- Rafael Cabrera Bello is ranked 60th in the world, 52 spots below where Lee Westwood ranks. But rankings made no difference on Thursday, as the Spaniard knocked off Westwood in 19 holes in one of the biggest upsets in the first round.
Cabrera Bello, a 15th seed, will now play Martin Kaymer in the second round of the Player bracket.
Cabrera Bello was making just his second appearance in this event, having lost in the first round last year to Jason Day. But he overcame a sluggish start to beat the second-seeded Westwood, who had reached the semifinals here last year.
"Obviously the odds were in his favor," Cabrera Bello said, "but in match play, anything cann happen. I just tried my best and I was fortunate enough to win."
Westwood was 2 up through five holes, with Cabrera Bello bogeying three of those holes. But he steadied himself to play bogey-free golf the rest of the match.
He was still 3 down at the turn but he won the 10th hole with a birdie, then squared the match with pars at the 13th and 14th holes.
Westwood regained the lead with a birdie at the 15th but gave it back when he bogeyed the 18th, missing a 7-foot putt that would have clinched the win.
Cabrera Bello then won the match on the first extra hole when he rolled in a birdie putt from 10-1/2 feet.