The left-hander produced one of the best performances of his career to win his fifth major at The Open in 2013, but his memorable triumph at Muirfield remains his last victory worldwide.
Mickelson hasn't officially withdrawn from the U.S. Open, which starts June 15 at Erin Hills in Wisconsin. Mickelson said that he had wrestled with the latest conflict for months and that Amanda had assured him that she would not mind if he were absent. She'll be giving the commencement speech for the school and I'm going to be there,"Mickelson told reporters after the third round of the Memorial tournament in Dublin, Ohio".
Mickelson said he had notified the US Golf Association of his decision well in advance so that the organising body as well as his replacement would not be caught off guard.
The U.S. Open is the only major Mickelson has not won. "I'm always holding out hope".
"Yeah, I go back and every year at the U.S. Open, I think back about that '99 Open, " Mickelson said. In 2013, Mickelson left Merion to attend Amanda's grade school graduation.
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Now, he'll mostly likely be watching on television.
"I don't know what will happen, but it doesn't look very good".
Amanda is Mickelson and his wife Amy's oldest child and turns 18 this month.
"I'll actually really enjoy watching them get punished out there", Mickelson said. "Unfortunately it comes on the Thursday of the Open, around 10 in the morning Pacific, so there's really no way to make it no matter what the tee-time is". You just need to be there.