Nice: Top-seeded John Isner hit 13 aces on his way to a hard-fought 7-6 (3), 7-6 (5) win against Belgium's Xavier Malisse at the Open de Nice on Wednesday.
The hard-serving American won a match in which neither player conceded a break point, and will play Nikolay Davydenko in the quarterfinals after the Russian topped seventh-seeded Denis Istomin of Uzbekistan 6-4, 1-6, 6-3.
No. 2 Gilles Simon of France and No. 3 Nicolas Almagro of Spain also advanced to the last eight.