Mikhail Kukushkin has reached the quarter-finals of the St. Petersburg Open, while Adrian Mannarino was eliminated in the second round.

Kukushkin, the 2010 champion, recovered from 4-2 down in the first set to win 7-6 (7-2) 6-2 against 2017 champion Damir Dzumhur, who saved four match points before he was finally beaten on Wednesday.

The sixth-seeded Kukushkin will play either Karen Khachanov or Joao Sousa in the quarter-finals.

The seventh-seeded Mannarino was beaten 6-3 6-1 in just over an hour by qualifier Egor Gerasimov, who last reached a tour-level quarter-final in October 2018.

Norway’s Casper Ruud came through a tough first-round encounter with Alexander Bublik 6-7 (3-7) 6-4 6-2.

The eighth-seeded Ruud plays Salvatore Caruso in the second round.

It was the first indoor win on the ATP tour for the 20-year-old Ruud, who is usually considered a clay-court specialist.