Winston-Salem - Nicolas Mahut of France beat Slovakia's Blaz Kavcic 6-3, 6-2 on Sunday to set up a second-round match against third-seeded Tommy Robredo at the Winston-Salem Open.
Bradley Klahn beat fellow-American Noah Rubin 6-2, 0-6, 7-6 (5) in their first-round match. Klahn will face top-seeded John Isner in the second round.
Robin Haase of the Netherlands had a 6-4, 2-6, 6-2 victory over Benoit Paire of France, while Germany's Benjamin Becker came back to beat Spaniard Pablo Carreno Busta 6-2, 2-6, 6-1.
Germany's Dustin Brown beat Colombia's Alejandro Gonzalez 6-3, 6-2 and will next face No 5-seeded Guillermo Garcia-Lopez.Results on Sunday, the first day of the ATP tournament in Winston-Salem (x denotes seeded player):
Bradley Klahn (USA) bt Noah Rubin (USA) 6-2, 0-6, 7-6 (7/5)
Robin Haase (NED) bt Benoit Paire (FRA) 6-4, 2-6, 6-2
Ryan Harrison (USA) bt Jan-Lennard Struff (GER) 6-4, 6-2
Nicolas Mahut (FRA) bt Blaz Kavcic (SLO) 6-3, 6-2
Benjamin Becker (GER) bt Pablo Carreno-Busta (ESP) 6-2, 2-6, 6-1
Dustin Brown (GER) bt Alejandro Gonzalez (COL) 6-3, 6-2