(Reuters) - South Korea's Ryu So-yeon birdied five of her last eight holes to power into a two-shot lead after Friday's second round of the Yokohama Tire LPGA Classic in Prattville, Alabama. Seeking her fourth LPGA victory, the 2011 U.S. Women's Open champion fired a flawless seven-under-par 65 despite breezy conditions on the Senator Course at Robert Trent Jones Golf Trail. Ryu, who has recorded two top-10s in eight starts on the LPGA Tour this season without notching a win, covered her back nine in a sizzling five-under 31 to post a nine-under total of 135. More...