Masters champion Phil Mickelson

Masters champion Phil Mickelson withdrew from his pro-am group at the Quail Hollow Championship on Wednesday, complaining of illness.Mickelson was sick at his hotel Tuesday night and called for assistance after the fifth hole at Quail Hollow Club. He was treated for dehydration at the on-course medical center.

Mickelson still expects to make his first-round, 12:50 p.m. tee time Thursday, according to a statement released on the player's behalf.

This is Mickelson's first PGA Tour event since winning the green jacket at Augusta National three weeks ago.

Mickelson spoke with reporters Wednesday morning, played the first five holes of the pro-am with partners Tim Belk and Bruce Rockowitz and then withdrew from the rest of the round.