"We all understand there's a long way," said Woods, who won his first of two consecutive PGA Championships at Medinah in 1999. "We have to keep plugging along and we all did that today. We missed a couple shots here and there and got up and down."
"I felt like I was playing a lot better than I showed today," said Mickelson.
Billy Andrade shot 5-under 67 and is alone in third place.