Mickelson raised his arms in mock celebration when the ball went in, a far cry from Saturday when he ran up a hefty 10 on the same hole, including a two-stroke penalty for his transgression, which could even have seen him disqualified from the tournament.
He carded a respectable one-under-par 69 on Sunday, a 12-shot improvement on his third round but of largely academic interest after Saturday's performance.
Mickelson had nothing to say to the media after signing for a 16-over 296 total.
He chatted with his family after emerging from the scoring room, and then signed autographs before walking away.
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The five-times major champion was lambasted on Saturday night by some current and former players, many of whom said the Californian should have been disqualified for his transgression, particularly after saying it was a deliberate move and not the result of a brain freeze.
Mickelson, who turned 48 on Saturday, will have to wait until Pebble Beach next June for another chance to complete a career grand slam.
Rickie Fowler, who played with Mickelson on Sunday, said they had briefly discussed Saturday's incident.
"He joked about it right as we went down the first hole," Fowler said.
(Reporting by Andrew Both; Editing by Hugh Lawson)
