FORT WORTH: American Dustin Johnson fired a bogey-free five-under par 65 on Thursday (Friday in Manila) to claim the first-round lead at the USPGA Tour’s $6.4 million Colonial tournament. Three-time winner this season Jimmy Walker was among a group of 10 players tied for sixth at three-under 67. Walker was joined by Jason Dufner, Jordan Spieth, Tim Clark, Brice Garnett, Freddie Jacobson, Bo Van Pelt, Ken Duke, David Hearn and Wes Roach. Defending champ Boo Weekley posted a one-over par 71 and is in a large group of players tied for 64th that also included Australian Adam Scott. Scott is playing for the first time since taking over the world number one ranking from Tiger Woods on Monday (Tuesday in Manila).