Kukushkin defeats Dzumhur at St. Petersburg Open

ST. PETERSBURG, Russia (AP) — Mikhail Kukushkin reached the quarterfinals of the St. Petersburg Open on Tuesday, while Adrian Mannarino was eliminated in the second round.
Kukushkin, the St. Petersburg champion in 2010, recovered from 4-2 down in the first set to win 7-6 (2), 6-2 against 2017 champion Damir Dzumhur, who saved four match points before he was finally beaten.
The sixth-seeded Kukushkin will play either Karen Khachanov or Joao Sousa in the quarterfinals.
The seventh-seeded Man