Chamblee shot 5-under 67 to take the early second-round lead at 12-under-par 132. Hes two shots clear of Steve Pate (66) and Bob Tway (67).
Chris Smith, Loren Roberts, David Peoples, Scott Simpson and first-round leader Michael Allen, seven shots worse than his opening 64, stayed close at 135.
Though hes yet to win, Chamblee has had a successful West Coast swing. He tied for sixth at his first event of the season, the Bob Hope. He then tied for 15th the following week in Phoenix, and stands 40th on the money list with $184,857.
The 39-year-old was only two shots off the four-round lead at La Quinta, but couldnt keep the pace Sunday, shooting 70.
Friday, Chamblee had no problems scoring, recording five birdies and no bogeys. The 1998 Greater Vancouver Open champion has yet to post a bogey over 36 holes at Tucson National.
Like Chamblee, Pate and Tway are each trying to snap winless streaks. Pate hasnt won since the 1998 CVS Charity Classic. Tway last tasted victory in the 1995 WorldCom Classic.
Pate is coming off his worst season since a wrist injury sidelined him in 1996. The 40-year-old Californian collected only one top-10 finish in 2001, ending the season 151st in earnings.
Tway finished last year 48th on the money list, thanks in large part to his early-season success. The 42-year-old Oklahoman tied for second at the Nissan Open, tied for third at this event, and tied for fourth at the Bob Hope.
The cut fell at 140, and 73 players got in.
Jim Carter, the 2000 champion, made the cut at 139, but defending champion Garrett Willis made an early exit after his back-to-back 71s.
Full-field scores from the Touchstone Energy Tucson Open