Rory McIlroy is the leader through one round of the Mexico Championship, two strokes ahead of Bubba Watson and Justin Thomas.
McIlroy ripped a 4-iron from 275 yards into the thin air at Chapultepec to 15 feet for eagle on his second hole, made five more birdies and opened the Mexico Championship with a 6-under 65.
Canada's Corey Conners is tied for fourth place heading into the second round of the P-G-A's Mexico Championship.
The Listowel native opened with a 3-under 68 yesterday and is three shots back of McIlroy.
This is the only World Golf Championship that McIlroy hasn't won as he tries to join Dustin Johnson as the only players to win all four of them.
Bryson DeChambeau and Billy Horschel are tied with Louis Oosthuizen and Corey Connors at minus-3, while Hideki Matsuyama, Paul Casey, Patrick Reed and Lee Westwood are among six players at 2 under.