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Seamus Power shot a 5-under par 65 to take the first round lead. Seamus Power leading by one shot over a group of 11 golfers. Two-time defending champ Daniel Berger shot a 70. Second-ranked Dustin Johnson shot a 67. Mickelson and Stricker shot 4-under 66. Mickelson matched his best opening round in relation to par this season.