Early in Phil Mickelson’s first round at the Houston Open, he called over a rules official and asked if he could replace his driver, which had a tiny crack in it. His request was denied because the crack wasn’t large enough. Watching the telecast, I noticed Phil kept using the driver, but it was clear he was concerned about the potential crack. Turns out it might not have been a problem. He’s still switching to his backup driver, just in case, though.