Top seed and defending champion Fish easily advanced past his promising 19-year-old compatriot Ryan Harrison 6-2, 6-4 in their last-four encounter.
Fish, who did not drop serve while breaking Harrison on three occasions in a match that lasted an hour and 19 minutes, said he was expecting a tough challenge from Isner on Sunday. Big-serving Isner prevailed over Luxembourg's Gilles Muller 7-5, 6-7, 6-1 in the other semifinal, firing down 28 aces In the process.
Published 24 July 2011, 15:48 IST