I'm guessing you don't play a lot of golf. Augusta and Southern Hill both have a difficult slope rating of 137, but nothing compared to Bethpage Black at 155. This years US Open course has a slope rating of 146 so it will be much more difficult to play. It's a USGA event, and the US Open is always more difficult to play with having the thickest rough and fastest greens.The 2 courses he played- Augusta and Southern Hills- are among the most difficult walks of any golf course on the PGA Tour. The good news for him is that the US Open and British Open shouldn't be quite as bad.