If the question is, "Who can stop Rory McIlroy?" then the answer could emerge during Saturday's third round of the PGA Championship – with Phil Mickelson, Rickie Fowler and Jason Day among several capable players within striking distance.
The day will start with McIlroy, who won his last two starts in last month's Open Championship and last week's WGC-Bridgestone Invitational, holding a one-shot lead over Day and Jim Furyk.
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