Mickelson entered play on Sunday five groups ahead of the leaders and in good position, but with just two birdies on the front nine and then a bogey on number ten, most golf experts had written 'Lefty' off and out of the mix.
With the leaders struggling and conditions tough, Mickelson made a late move with birdies on 13 and 14, catapulting him past the likes of Lee Westwood, Tiger Woods, and Adam Scott. A birdie on 17 all but sealed the victory, but the 43 year-old made another on the final hole and won the Claret Jug by three shots.
was leading heading into the final round and looking for his first Major Championship, but three bogeys in the first eight holes dropped the 40 year-old out of contention.
Woods also struggled with three bogeys in his first three holes and six
total in his round as his bid to capture his first Major in over five years fell flat.
Henrik Stenson finished second after a solid round of 70 and even par for the 2013 Open Championship. Ian Poulter also had a strong finish with a terrific round of 67, to finish in a tie for third with Scott and Westwood, but the day belonged to Mickelson as his name will now go down in history at an event he has struggled to play well in the past.