By Doug Ferguson The Associated PressAUSTIN, TEXAS — Rory McIlroy put together another flawless back nine, running off five straight birdies. This time, it wasn't enough. Former Oklahoma State golfer Peter Uihlein built a 5-up lead against McIlroy and held off his late charge with enough key shots of his own in a 2-and-1 victory, one of several surprises Wednesday in the opening session of the Dell Technologies Match Play. Defending champion Dustin Johnson hit two shots out-of-bounds on the same hole, another tee shot in the hazard and couldn't make the putts that he couldn't afford to miss on the back nine.Read more on NewsOK.com