Oosthuizen withdraws from U.S. Open with hip injury

Louis Oosthuizen of South Africa hits from a sand trap on the second hole during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Mike Segar

ARDMORE, Pennsylvania (Reuters) - Former British Open champion Louis Oosthuizen pulled out of the U.S. Open on Friday, citing a strained hip flexor.

The 30-year-old South African, who clinched his only major title at the 2010 British Open, opened with a five-over-par 75 at the Merion Golf Club then withdrew before the start of his second round.