2013 British Open leaderboard: Zach Johnson early leader, Mark O'Meara near top

Stuart Franklin

There's a heavy American presence on the leader board at Muirfield early Thursday.

Zach Johnson completed his first round to lead the field of the 2013 British Open. Johnson currently sits in first place with a 5-under 66, one stroke in front of his nearest competition.

56-year-old Mark O'Meara sits in second place with 4-under through his first 11 holes. He is tied there with Rafael Cabrera-Bello, who wrapped up his first round earlier in the morning.

Brandt Snedeker, who was also among Thursday's early tee times, made a push down the stretch to finish 3-under, currently good for a fourth-place tie. Through 14 holes, Snedeker sat at 1-under, but rallied to close his first round at 68.

Phil Mickelson finished his first round at 2-under, making four birdies and two bogeys.

Check out the complete leaderboard at The Open Championship's official site.

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Phil says he's found his "putting secret," leaves driver at home

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