Shane Lowry admits rules farce at US Open did affect his play

"The few days after the U.S. Open were quite tough. I was driving myself mad."

Shane Lowry has admitted that the rules fiasco during the US Open final round at Oakmount affected his play more than it had initially been reported.

The world number 25 held a four-shot lead going into the final round before he shot a closing 76 to finish three shots behind eventual winner Dustin Johnson.