BANGKOK: Tenth-ranked Gilles Simon of France, playing his first match in a month, routed American Kevin Kim 6-2, 6-2 to reach the quarter-finals at the Thailand Open.

Second-seeded Simon, who was forced to retire with a knee injury while facing Juan Carlos Ferrero during the third round of the US Open, dominated play with an impressive baseline game to wrap up the second round match in just 61 minutes.

“I didn’t know what to expect but I played a good match,” said the 24-year-old, who had a first-round bye. “My knee is still shaky but I tried not to think about it. I can play today but sometimes I wake up in the morning and it’s painful.”

Eighth seed John Isner of the United States also advanced to the quarter-finals by defeating Mischa Zverev of Germany 7-6 (5), 6-4. Isner will next face No 4 seed Viktor Troicki of Serbia, who advanced to the quarters by beating Thomaz Bellucci of Brazil on Wednesday.

Germany’s Andreas Beck also cruised into the quarter-finals with a 6-1, 6-7 (3), 6-4 victory over Donald Young of the United States. Beck will play sixth-seeded Jurgen Melzer of Austria, who won his second-round match against Turkish qualifier Marsel Ilhan on Wednesday.