Hunter Mahan birdied two of the last three holes on Friday to shoot a 6-under 65 and take a 2-stroke lead after two rounds of the AT&T National.
Mahan, the 2009 runner-up, finished 36 holes at 7-under-par 135. He has won twice earlier this year giving him five PGA Tour victories and is coming off a final-round 61 at the Travelers Championship.
Brendon de Jonge and Jimmy Walker both posted 2-under 69s to remain tied for second place at minus-5. They were joined there by Robert Garrigus, who carded a 4-under 67 in round two.
Former British Open champion Stewart Cink shot a 3-under 68 to move to 4- under-par 138. He shares fifth place with Vijay Singh (70), Rod Pampling (67), Pat Perez (69) and Seung-Yul Noh (68).
First-round leader Bo Van Pelt stumbled to a 2-pover 73 to fall into a tie for 11th at 2-under-par 140 on the Blue Course at Congressional Country Club.
Tiger Woods had an eagle, a bogey and two birdies in a round of 3-under 68 to join Van Pelt and two others at minus-2.
Defending champion Nick Watney managed a 1-over 72 to slip into a share of 19th at even-par 142.
MORE TO FOLLOW.