Chappell heads Walker, Casey by one at Boston TPC (Reuters)

View photosMoreSep 3, 2016; Norton, MA, USA; Kevin Chappell hits a shot from the rough after an errant drive on the 13th hole leading to a bogie during the second round of the 2016 Deutsche Bank Championship golf tournament at TPC of Boston. Mandatory Credit: Mark Konezny-USA TODAY Sports(Reuters) - Kevin Chappell, a three times runner-up this season, has another chance to earn his maiden PGA Tour win after moving into a one-shot lead over Jimmy Walker and Paul Casey after two rounds of the Deutsche Bank Championship in Massachusetts on Saturday.

Chappell, buoyed by an eagle at the par-five seventh after pitching in from the fairway 35 yards out, carded a seven-under-par 64 on the tree-lined…