At the U.S. Open at Merion, Mickelson entered the final round leading by one stroke after rounds of over the first three days, but he started the final round by three-putting the 3rd and 5th holes for double-bogeys to fall out of the lead. He regained the lead at the par-four 10th, when he holed his second shot from the rough for an eagle. However, a misjudgment at the short par three 13th saw him fly the green and make a bogey to slip one behind leader Justin Rose. Another bogey followed at the 15th, before narrowly missing a birdie putt on the 16th that would have tied Rose. Mickelson could not make a birdie at the 17th and after a blocked drive on the 18th, he could not hole his pitch from short of the green, which led to a final bogey.