Commentating on the incident for Fox, former Ryder Cup captain Paul Azinger said: "That's the most out of character I have ever seen Phil".
Mickelson went on to shoot a round of 81 and sits third last of those that made the halfway cut on 17-over par.
That's was John Daly's reasoning when he pulled a similar stunt at the 1999 U.S. Open at Pinehurst, saying it was his response to poor pin positions. I've had multiple times where I've wanted to do that.
Mickelson has finished runner-up at the US Open on six occasions. "He's putted bad enough that I think he just snapped at how bad his speed was on that putt".More news: South Korea mulling tour programmes in North Korea
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"It's something you might see at your club with your mates. I've had it with the USGA and the way they run their tournaments". On the 18th hole in the second round, Triplett stuck his putter in the ground as a backstop when his ball was headed back down from the hole.
Contributing to his downfall was a meltdown on the par four 13th.
Well behind on the leaderboard, Mickelson claims to have taken the two-shot penalty as it would have been worth more to him than a continued flurry of missed putts; "I didn't mean disrespect.it's meant to take advantage of the rules as best as you can". The 5-time major champion then struck the ball back at the hole, saw it lip out, then marked it before playing his next shot. I took the 2-shot penalty and moved on. After some confusion, his score was changed to a 10 to reflect the two-stroke penalty for hitting a moving ball.
The greens have been a nightmare for the world's best golfers as only one player is under par and numerous game's biggest names failed to make the cut.