Scott is 2 under par at Muirfield in Gullane, Scotland. The Australian moved into the lead with four birdies over a five-hole stretch between the seventh and 11th holes.
Mickelson made consecutive birdies on the 13th and 14th holes to reach 1 under. Westwood, who brought a two-shot lead into today’s play, is 2 over through 10 holes.
Tiger Woods is 4 over for this round and trails Scott by five shots.
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