Three to watch
'The Iceman' denied Phil Mickelson the Claret Jug after an epic final-round battle at Troon in 2016. At 42, he's at the peak of his powers, ranked first on the PGA Tour for greens in regulation, second for proximity to the hole and third for strokes gained from tee to green. That's US Open form.
He might have missed the last two US Open cuts but with four wins since last year's WGC-Champions, he's clearly in form and has the discipline and the iron play to survive until the back nine on Sunday.
After regaining the world No 1 spot in style last Sunday by holing his approach to the 72nd hole to win the FedEx St Jude Classic, the 2016 champion has his swagger back. Cut last year, he has one win and two top-4 finishes since 2014. If his putting resurgence continues, he'll be a force.