Three-time Grand Slam champion Stan Wawrinka advanced to the quarter-finals of the St Petersburg Open on Wednesday with a win over Russian fourth seed Karen Khachanov in two tie-break sets. The 33-year-old Swiss star Wawrinka, a wildcard entry, knocked off world number 24 Khachanov 7-6 (12/10), 7-6 (7/1) and awaits the winner between defending champion Damir Dzumhur and Guido Pella.
"I'm really happy as the level of my play was really good today," Wawrinka said. "We both played really well, really aggressive. "I was expecting a tough match and it was really tough. My level was great and I'm really happy with everything that took place on the court today." Wawrinka, the former world number three, who is now down at 88 after a battle with injury, started confidently breaking his rival's serve early.
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