Mickelson's ace was the fourth in three years of PGA Tour play on the Mystic Rock course at the Nemacolin Woodlands Resort. Three of the four were at No. 7, a downhill hole that can play as long as 223 yards and is guarded by a large bunker on the left side.
The hole-in-one was the fifth of Mickelson's PGA career and the 23rd on tour this year. Mickelson was playing Saturday after almost missing the cut for the first time this year. He was at even par through two rounds.