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Englishman Tyrrell Hatton compiled four birdies on the back nine in a 67 but defending champion Phil Mickelson had eight bogeys and a double in a 79. McIlroy, who won the last of his 14 PGA Tour titles at the Arnold Palmer Invitational in March last year, eagled his 10th after sending a two-iron tee shot to five feet at the 307-yard par four. Ian Poulter returned six birdies in a 68, while fellow Englishman Tommy Fleetwood, runner-up to Johnson two years ago, dropped two shots in his final three holes in a 70. Tiger Woods, winner of 18 WGC titles from 1999-2013, also began at the 10th at Club de Golf Chapultepec and after a double bogey at his 10th, made three successive birdies en route to a level par 71.