Really impressive considering what he's dealing with and the afternoon course conditions to be where he is. I figured he'd make the cut but I have a feeling he'll fade tomorrow and Sunday as the fatigue sets in. Still, this is already a successful tournament.
It's also easy to forget, but he's old. So even if healthy, playing this well is rare at his age. There have been only 2 majors won over the age of 46. He's at the cliff.