South Africa’s Louis Oosthuizen matched U.S. clubhouse leader Russell Henley for the overall lead on Thursday before darkness halted the first round of the U.S. Open, where Phil Mickelson struggled in his bid to complete a career Grand Slam.

Oosthuizen, the 2010 British Open champion, made three consecutive birdies to close his first nine after starting on the 10th tee, then added an 11-foot birdie putt at the fifth to reach 4-under.

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