"I don't know what to say. It's been a tough go the last four years, not playing my best, but to have the belief that I was going to get there and to finally break through and do it was incredible," said Mickelson, who at 47 became the oldest winner of a WGC title. "I believe that more is to come, and I feel like I'm starting to play some of my best golf. To culminate here in Mexico City with a World Golf Championship victory is exciting to me beyond words because it just validates the hard work I put in and the struggle for the last few years to finally get my game back."