Two of the area’s top offensive players did not play in Friday’s Manteca-Sierra rivalry grudge match at Daniel Teicheira Memorial Stadium.It didn’t matter. With starting quarterback Alex Martinez out with a broken thumb on his throwing hand, Manteca relied on its ground game and hard-hitting defense to produce an emphatic 28-7 victory. The Buffaloes improved to 3-0 in the Valley Oak League and 6-0 overall while extending their all-time lead over Sierra, 12-5.The 17th installment of this crosstown series wasn’t close after the last four meetings were each decided by no more than eight points, and it was thanks to the dominant play of Manteca’s linemen.