Phelps' miraculous putt was 153-feet in distance (51 yards). The ball took 17 seconds from leaving Phelps' putter to falling into the hole. It is believed to be the longest made putt ever shown live during a television broadcast.
Where did it happen? At the 2012 Alfred Dunhill Links Championship in Scotland, on the Kingsbarns course. Phelps was playing in the pro-am.
Phelps has been working with instructor Hank Haney as part of Haney's Golf Channel series The Haney Project. So far, looks like Phelps will be a bit more successful than Haney's previous projects.