The world's No. 1-ranked player entered the final round of the U.S. Open with nothing to lose, really. At 4 over, he was eight shots out of the lead.
Anything can happen in a U.S. Open, but, let's be honest -- low numbers aren't easy to come by.
Evidently, Rory McIlroy never got that memo.
McIlroy was 6 under through his first 13 holes with six birdies, including this bomb on No. 13 from 72 feet:
For the record, Johnny Miller has the lowest final round in U.S. Open history -- an 8-under 63 at Oakmont in 1973. Miller won that year by one shot over John Schlee.