WEST CHESTER — As New York prepares for the U.S. Open in Flushing, N.Y., Penn Oaks Tennis and Fitness Center has their eyes on introducing the game to future stars. Joining with the organization that sponsors the U.S. Open– the United States Tennis Association (USTA) — on August 31 Penn Oaks is beginning a quick-start program for junior players between the ages of 5 and 12.   Club owner,...