
15-year-old Cole Hammer during the first round of the 2015 U.S. Open Championship at Chambers Bay, Washington.

The year's second golf major attracted a large crowd Thursday.

Dustin Johnson looks for his ball after a stray tee shot at the 10th hole but would recover to lead during early morning play.

Phil Mickelson was one of the first players on the course at the U.S. Open Thursday and started strongly before fading as his round progressed.

Another player to make a strong start was Patrick Reed, spotted here relaxing against his putter.

Germany's Martin Kaymer was looking to defend the title he won in 2104.

Tiger Woods was a late starter at Chambers Bay Thursday.

Rory McIlroy plays out of the bunker on the 18th hole at the Chambers Bay course. The Northern Irishman would finish the day with a two-over-par 72.