View photo
(Reuters) - Phil Mickelson is racing against father time as much as his competitors as he tries to complete a career grand slam of the four majors by winning the U.S. Open.
Mickelson, who has been runner-up in his national championship a record six times, will celebrate his 45th birthday on Tuesday, just two days before the opening round of the 115th U.S. Open, being played at Chambers Bay in Washington.
Should he go on to claim the title in the Pacific Northwest, he would become only the sixth player to win all four modern majors.