DUBLIN, Ohio (AP) - Phil Mickelson has withdrawn from the Memorial because of mental fatigue.

Mickelson opened with a 79, his worst score in his 12 appearances at Muirfield Village. He says a trip to Europe to celebrate his wife's 40th birthday, and then returning home for a corporate outing and the pro-am took a lot out of him. With the U.S. Open in two weeks, Mickelson says he's thinking "big picture" by going home to rest for a few days.

The four-time major champion believes it's a responsibility for a player to finish a tournament. He says he's overruling himself in this case.

It's the first time Mickelson has withdrawn without physical injury. The last time he left a tournament early was at the Memorial four years ago because of a wrist injury.

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