Jimmy Walker secures his second title this season with a five-shot win . Walker held off a late challenge from runner-up Jordan Spieth . 21-year-old Spieth carded five birdies on the last four holes .
Jimmy Walker secures his second title this season with a four-shot win . Walker held off a late challenge from runner-up Jordan Spieth . 21-year-old Spieth carded four birdies on the last five holes .