Top seed Richard Gasquet reached the quarter-finals of the Kremlin Cup with a 6-3 3-6 6-1 win over Russia's Evgeny Donskoy.
Gasquet broke twice on the way to taking the opening set but Donskoy hit back to force a decider.
A run of five straight games allowed Gasquet to dominate the third set and the Frenchman closed out victory on his second match point.
"It's my first time at this tournament but I've been here in Moscow twice before playing in the Davis Cup and I have good memories from that visits," said Gasquet.
"I have experience and I just added power in the beginning of the third set and I managed to break him for a 3-0 lead and that made the difference."
Gasquet remains in the hunt for a place at the season-ending ATP World Tour Finals in London.
He is currently one place outside the qualification spots, trailing his compatriot Jo-Wilfried Tsonga, who is playing in Vienna this week, by 50 points.
Also on Thursday, veteran Croat Ivo Karlovic fired 16 aces to eliminate fifth-seeded Denis Istomin of Uzbekistan 6-3 6-7 (10/12) 7-6 (8/6), qualifier Mikhail Kukushkin of Kazakhstan defeated fourth-seeded Ukrainian Alexandr Dolgopolov 6-4 6-4 and Russian Teymuraz Gabashvili saw off Dudi Sela of Israel 6-1 6-7 (7/9) 6-1.