It looked like the best golfers in the U.S. Open field would be tightly bunched at the top of the leaderboard at one or two under until the dregs of the first round.
However, Martin Kaymer, who teed off just before 2 p.m. ET, birdied three of his final four holes to move to five under for the day and emerge from the pack. He finished three strokes ahead of Kevin Na, Graeme McDowell, Brendon de Jonge and the unheralded Fran Quinn.
Behind those at two under, 10 golfers were at one under at day's end.
Thus, it's not a spoiler to say that Kaymer, who led by three at the conclusion of play, will be a golfer to watch in the second round.
Who besides the 29-year-old German should you be keeping an eye on? Read on to find out.