Michael Allen shot a 4-under 68 Saturday to open a one-stroke lead over fellow Americans John Cook and Jay Don Blake after two rounds of the Songdo IBD Championship. Cook and Blake shot 5-under 67s and are 9-under 135 heading into Sunday’s final round at Jack Nicklaus Golf Club Korea. Mark O’Meara (69) and David Peoples (70), a co-leader after the first round, were a stroke back at 8-under.