World number three Rory McIlroy hit a one-under-par 71 in the first round of the WGC-Cadillac Championship in Florida, leaving him five shots off the lead.
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The Northern Irishman, who has changed his putting grip for this tournament, scored five birdies, but he dropped shots on the 13th and 18th holes.
The four-time Major winner suffered another blow on the ninth hole when he hit a double bogey, leaving him tied 16th in the field.
Scott Piercy and Marcus Fraser currently share the lead on six-under 66, with the former hitting eight birdies and two bogeys and his opponent carding seven birdies and a solitary bogey on the eighth hole.
Phil Mickelson sits one shot off the pace after carding a five-under 67, while world number one Jordan Spieth is three shots behind.
