USGA driver testing has been a big topic this week, and Xander Schauffele threw more fuel on the fire on Sunday ...

Rory McIlroy declined to speak to the media for the fourth day in a row at the US PGA Championship, as he finished outside of ...

Rory McIlroy and Scottie Scheffler's drivers were deemed "nonconforming" during a standard test earlier this week at Quail ...

Rory McIlroy and Scottie Scheffler's drivers failed conformance tests at the PGA Championship. Could YOU be using an illegal ...

Why was Rory McIlroy's driver non-conforming, what is the process for testing on tour and what does it all mean? Let's ...

"I think, if we're going to do it, we might as well do it right, get more robust and get even more strict,” Scheffler said.

Rory McIlroy did not speak with the media at the PGA Championship, as news surfaced that his driver had been flagged by the ...

McIlroy's driver is believed to have been deemed non-conforming Tuesday. When reached for comment, the USGA confirmed testing ...

Rory McIlroy switched TaylorMade driver heads this week ahead of the PGA Championship. The reason why is unclear.

The USGA tested Rory McIlroy's driver and concluded that it did not meet established standards, forcing him to change it ...

The Northern Irishman went from favorite at Quail Hollow to struggling off the tee. It might be more than a coincidence.

The PGA of America says Rory McIlroy was part of some 50 players who had drivers tested before the PGA Championship.