 Spieth finished with a final round 69 — three strokes clear of Kuchar, who also carded a 69 – and became just the second player in history after Jack Nicklaus to win three of the four men's golf majors before his 24th birthday.Spieth later gifted the 3-iron from that shot on the 13th hole back to Royal Birkdale.After finishing in a tie for 13th at the WGC-Bridgestone Invitational, Spieth headed to the final major of the year, the PGA Championship, with the opportunity to become just the sixth man in history, to win the career grand slam.