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Fox went birdie-birdie in the final two holes to finish at two-under with an opening round of 68.
That placed him in a tied for 11th with players still out on course, three strokes behind early leader Rickie Fowler.
Nine players sit at three-under including Ian Poulter, Jason Day and Stewart Cink.
Fox started the day well with a birdie on the first hole and moved to two-under at the turn with a second birdie at the par five eighth hole.
But bogeys at the 11th and 15th holes saw the world number 82 slip back to even par before closing out the day on a high.
Tiger Woods rallied from a bogey-double bogey start to shoot an even-par 70.
Woods missed his first two fairways and dumped an approach shot in the water. But scrambled for enough pars to keep his round going, then made a pair of birdies on a bogey-free second nine.
Playing partner Justin Thomas was one-under and Rory McIlroy also was even.