In a dominant performance, a pumped-up Ymer was strong on serve as he fired 10 aces and won 80 per cent (24/30) of his first-serve points to capture the biggest victory of his career after one hour and 36 minutes.
“It is my highest win ever,” Ymer said in his on-court interview. “I am really happy. It is big for me. I have been fighting a lot and I was serving amazing today. I hope to keep it going. I am so happy to finally get this win.”
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It is the first time the World No. 163 has advanced to the last eight at a tour-level event since 2016, when he reached the quarter-finals in Gstaad. With his triumph, it is just the second time Ymer has defeated a Top 50 opponent, with his only other success coming against then-World No. 41 Nick Kyrgios in Barcelona in 2015.
Ymer, who is making his debut in Pune, held his nerve in the second-set tie-break against the World No. 15, sealing his win with an ace. The 25-year-old will next face eighth seed Stefano Travaglia after the Italian overcame Indian Yuki Bhambri 6-3, 6-2 in 74 minutes.
The World No. 80 lifted the trophy at the Tata Open Maharashtra in 2020 and set the wheels in motion for another deep run, breaking the 25-year-old four times to advance after 90 minutes.
Vesely will next play sixth seed Emil Ruusuvuori in the quarter-finals after the Finn downed Czech qualifier Vit Kopriva 6-3, 6-3 in their first ATP Head2Head meeting. Ruusuvuori has enjoyed a strong start to the season, having advanced to the last four at the Melbourne Summer Set last month.