American Brooks Koepka made three birdies on the back nine to charge past hometown favourite Jordan Spieth and into a two-shot lead after the third round of the Byron Nelson Classic in Texas.
Koepka posted a five-under-par 65 for a 16 under total at the TPC Four Seasons Resort in Irving, while Spieth closed with bogeys at 14 and 18 for a 14-under 67 to drop back into second place.
US Open champion Spieth held the outright lead but an errant tee shot at the par-four 14th found water, resulting in his first bogey of the day and a two-shot swing there as Koepka drained a 20-foot birdie putt.
Americans Matt Kuchar (65) and Bud Cauley (68), and Spaniard Sergo Garcia (68), were tied for third at 13 under while overnight leader Ben Crane struggled to a 72 to fall six strokes off the pace.
John Senden is the best-placed Australian in a tie for 39th at six under and is one shot clear of compatriot Stuart Appleby (T46).
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