Mickelson, who will be replaced in the field by world No. 68 Mikko Ilonen, cited “personal reasons” for his decision to not play the event at Harding Park in San Francisco. He's still committed to play in both The Players and the Wells Fargo Championship.
"I'm really happy with the new format and TPC Harding Park is a terrific setting for match play, so it's unfortunate that I won't be able to play this year," Mickelson told the Tour.
Lefty hasn’t played the Match Play since 2011 and has never advanced past the third round, although with this year’s format change to include round-robin pool play each of the 64 players is assured at least three rounds at Harding Park.
Mickelson tied for second in his last start at the Masters, his best finish on Tour since last year’s PGA Championship.