Rory McIlroy's PGA Championship driver switch has put driver testing under a microscope this week. Here's what you need to ...

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

According to Sobel, the USGA deemed McIlroy’s driver non-conforming on Tuesday. Earlier on Friday, Golf Digest sent a request for comment to McIlroy’s representatives about rumors of McIlroy’s driver ...