(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 TPC Boston in Norton for an 11-under 131 halfway total. PGA Championship winner Jimmy Walker (64) and Englishman Paul Casey (66) are on 10-under in the second of the Tour’s four FedEx Cup playoff events. More...