Depending on Tiger Woods, it could be the first time the 64-man field at the Match Play Championship is missing its two biggest stars when played in the United States.
The Match Play Championship is Feb. 17-21 outside Tucson, Arizona.
Mickelson said his wife, Amy, is responding well to breast cancer treatment and the longterm prognosis is good. He says medical procedures got in the way of previous vacations, and their three children are on holiday the week of Match Play.
The second-ranked Mickelson said other parts of his schedule also might be affected.