By Nick Selbe Golf is hard sometimes–even for the pros. View the original article to see embedded media. Grayson Murray’s Sunday round at the U.S. Open began with such promise. The 28-year-old strode to the first tee box at 8-over for the tournament, and was among the first tee times for the final round. He birdied the hole, perhaps setting himself up for a memorable conclusion to the weekend. Instead, that’s when everything started to fall apart. Murray bogeyed the second hole to move to even for the day, then parred the next four. The wheels fell off at hole No. 7, when Murray carded a quadr…