Phil Mickelson turned in the round of his life Wednesday. (Photo: Getty Images) Mickelson makes Grand Slam history with amazing 59 Phil Mickelson turned Poipu Bay Golf Course into his own personal playground Wednesday, firing an eye-popping 13-under-par 59 that shattered the PGA Grand Slam of Golf record of 61 and powered the reigning Masters Champion to victory in the exclusive event reserved for major winners. Amazingly, Mickelson hit only five fairways while registering the lowest round of life.