By Mark Lamport-Stokes OAKMONT, Pennsylvania (Reuters) - South Africa's Louis Oosthuizen "found something" in his swing out on the course before plundering five birdies on his back nine to soar into contention at the weather-disrupted U.S. Open on Saturday. Blessed with one of the most envied swings in the game, Oosthuizen rebounded from an opening five-over-par 75 to fire a five-under 65 on a challenging layout that was firming up at a sun-splashed Oakmont Country Club. "I didn't have a great first round, I felt as uncomfortable over the golf ball as I have in a while," 2010 British Open champion Oosthuizen told reporters after sinking a 12-footer on his final hole, the par-four ninth.
