(Reuters) - Phil Mickelson has a special relationship with the Farmers Insurance Open which is played in his native San Diego but he was considering withdrawing from the event after nursing a troublesome back in Thursday's opening round.
The American repeatedly winced at the top of his backswing as he carded a three-under-par 69 on the North Course at Torrey Pines and said his ultimate decision on whether to pull out would depend on how he responded to treatment.
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