Rory McIlroy reflects on U.S. Open meltdown in social media update

(Photo credit: Jim Dedmon-USA TODAY Sports)

After squandering a late lead over Bryson DeChambeau at the U.S. Open, Rory McIlroy called Sunday "probably the toughest" day of his professional golf career in a social media post Monday evening.

The Northern Irishman bogeyed three of his final four holes, letting DeChambeau win with a par save at the 72nd hole at Pinehurst No. 2 in North Carolina. McIlroy missed two par putts