(Reuters) - Northern Ireland's Darren Clarke has pulled out of next week's U.S. Open at Oakmont in Pennsylvania, citing poor form and his ongoing commitments as Europe's Ryder Cup captain. "I'm currently dedicating all of my time to our preparations for the Ryder Cup and unfortunately the U.S. Open is not the place to be when your game isn't 100 percent," Clarke, the 2011 British Open champion, said in a statement. "I'm very sorry to miss Oakmont but I'm sure it will be a brilliant week.
