Rory McIlroy’s new driver brings about concern as he shoots second-highest PGA Tour score before U.S. Open

Rory McIlroy’s new driver brings about concern as he shoots second-highest PGA Tour score before U.S. Open

PGA Tour star had to use new 'big stick' after nonconforming driver controversy at PGA Championship

Rory McIlroy hits his tee shot on the eighth hole during the second round of the RBC Canadian Open golf tournament. (Dan Hamilton-Imagn Images)

Rory McIlroy reacts after playing a bunker shot on the first hole during the second round of the RBC Canadian Open golf tournament. (Dan Hamilton-Imagn Images)

Rory Mcilroy watches his tee shot on the third hole during the second round of the RBC Canadian Open golf tournament. (Dan Hamilton-Imagn Images)