On Thursday morning the world's best golfers took to Pebble Beach for the U.S. Open.
The third major of the year, the U.S. Open proved to be the most-difficult course for professionals last year at Shinnecock. However, as the major shifted to California, Pebble Beach hasn't shown as much of a challenge.
Birdies are flying all over the course, with Scott Piercy holding the lead at five-under on the day.
One of the favorites coming into the tournament, Phil Mickelson, played solid through the first nine holes.
Mickelson started his round on the back nine, and remained even par until he made a major mistake at No. 3.
The six-time U.S. Open runner-up missed a one-foot putt. No, seriously.
Here was his putt for par.
That's a brutal mistake from someone who has had great success at Pebble Beach in the past.
Earlier this year, Mickelson won the Pebble Beach Pro-Am and looked poised to roll that success into the U.S. Open this weekend.
After the bogey putt, Mickelson sits at one-over par on the day. He has five holes left in his first round to bounce back from his brutal mistake.
Stay tuned for the latest from the U.S. Open.