Johnson was four shots clear of the field early on the back nine at Club de Golf Chapultepec in Naucalpan before back-to-back bogeys opened the door for the likes of Jon Rahm, Tommy Fleetwood and Ross Fisher, but the American held his nerve down the stretch to collect his fourth World Golf Championship title.
Fleetwood continued his impressive start to the year as he won the race for second by holing a huge putt for birdie on the final green, while Rahm was left to rue a poor finish as he three-putted the 16th and 17th greens to slip to 12 under alongside Fisher.