Rory McIlroy was forced to switch drivers at the PGA Championship after his regular driver was found to be non-conforming to rules in a test at Quail Hollow, according to a radio report.
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Sirius XM PGA Tour Radio reported that second-ranked McIlroy, who won the Masters last month to complete a career Grand Slam, had to make the change after US Golf Association found Tuesday that his driver was non-compliant.
McIlroy leads the PGA Tour in strokes gained through driving but was last in driving accuracy among 74 players who made the cut to play the weekend. He found only 10 fairways in the first two rounds.
Test results on clubs are kept private. They involve the flexibility of the face of a driver.
Drivers have been found to be conforming to the rules one week and fail a test the next due to general use of the club.
McIlroy has declined to speak with reporters after each of the first two rounds at Quail Hollow, a course where he has won four times in PGA Tour events.