Ruusuvuori won 7-6 (6), 6-4 over Aslan Karatsev
in the second round of Nur-Sultan on Thursday.
Ruusuvuori improved to 22-17 on the season as he surprised the No. 1 seed in a straight-set upset that spanned one hour and 59 minutes. The 22-year-old from Finland will try to reach his third semifinal of 2021 next when he faces Ilya Ivashka
, who he is already 0-2 against so far this season.