Phil Mickelson.
The only player to ever win the US Open missing half or more of the fairways was Angel at Oakmont in '07. I believe Phil has a similar game to Angel, and Phil's short game has to be a + this week. All depends on the flat stick.
Phil has a weirdly good record at "traditional" US Open venues; his six 2nd or T2 ... pre-restoration Pinehurst #2, Shinny, Winged Foot, Bethpage (twice), Merion.
Additionally, who doesn't want Phil to win. If he is in contention, he will be crowd favorite. I don't know why, but I think I might cry for Phil if he does win.