A U.S. Open Series eventFridayAt Atlantic StationAtlantaPurse: $585,870 (WT250)Surface: Hard-OutdoorSinglesQuarterfinalsDenis Kudla, United States, def. Dudi Sela, Israel, 7-5, 6-0. John Isner (1), United States, def. Ricardas Berankis, Latvia, 7-6 (5), 6-4. Marcos Baghdatis (5), Cyprus, def. Vasek Pospisil (2), Canada, 6-4, 7-6 (5). Gilles Muller (7), Luxembourg, def. Go Soeda, Japan, 7-5, 6-1. DoublesQuarterfinalsChristopher Eubanks and Donald Young, United States, def.