professor
Golf is a difficult game , even the best will hit a few bad shots , for these guys even a few millimetres off your plane means a missed putt or shot, add in the pressure of leading a Major Championship under difficult conditions and guys can make bogeys . Then they grind it out and get it back. Rory was 5 over after the front nine Thursday ended up 4 under and on forst page of the leaderboard.
They play 4 rounds to decide a winner, every player , bar none will have a few bad stretches over that period.