The Aronimink course has proven to be very difficult for the best golfers in the world.Frustrations have boiled over, proven by Jon Rahm accidently hitting a volunteer with a divot, and Justin Thomas’ group arguing with officials after being held up. Golfers have been frustrated by multiple factors at the PGA ChampionshipGettyOne of the key sources of frustration has been from the pace of play and it wasn’t helped by a bizarre moment on the 10th hole for Sahith Theegala.Theegala, lost his ball after hitting out of a bunker on hole 10. The American swung a big hook out of the sand, which hit a tree and vanished.Course officials and Theegala tried to find where his shot landed but couldn’t locate it within three minutes, and under rule 18.2, it officially became a lost ball. The delay caused a backlog, and cameras captured Rory McIlroy slumped up against the advertising board waiting to be able to proceed with his round.McIlroy was pictured slumped against an advertising boardXIt’s a rare occurrence that professionals lose their balls on the course. They hit their shots so straight and that there are many ball spotters spread around the hole they’re playing.“How the f*** does a golf ball go completely missing at a major championship with 20,000 people and cameras around?” one spectator posted on X.The PGA Tour winner had to go back to the bunker he played from.Eventually, after hitting out the sand with his fourth shot, Theegala found the green with his fifth, before two-putting for a double bogey seven.Theegala hit a wayward bunker shot that vanished in a bizarre momentAlamyTheegala spent three minutes searching for his ball before PGA rule 18.2 came into playGettyThe three-over score on the 10th dropped him from three-under to level-par, as the 28-year-old fell down the leaderboard.Vanishing golf ball is not the first time rules have come into play at AroniminkOn the opening round, Garrick Higgo received a two-stroke penalty for being late for his morning tee-time.“I never want to get to the tee 10 minutes before and be cold when I have to hit a driver, far and straight, hopefully,” he later told Sky Sports.“I usually hit five putts before I go to the tee. My caddie dropped my Trackman in the locker. I went to the putting green thinking: ‘I still have about five minutes’, and I obviously did not.“I hit one putt. I heard my name. My caddie was yelling at me. I headed down, and I got a two-shot penalty.”Justin Thomas, meanwhile, found his group put on the clock on Friday.Thomas, Bradley and Young were put on the clock on FridayAlthough they weren’t holding up the group behind, Thomas, Keegan Bradley and Cameron Young found themselves getting a warning.Thomas and Bradley were seeing waving their arms in protest at the PGA official, and the two-time winner would later vent his frustrations after his round.“We just didn’t really agree with it,” said Thomas after his round. “The hard part to me with the whole pace of play thing is that you, there’s so much that goes into golf and there’s so much that goes into hole to hole in terms of, are you hitting it close, are you able to tap it in, or you have to mark it, stuff like that, to where, are you holding the group up or are you not, to where it’s very hard to make that call. And we just didn’t agree with it, to be honest.