Kostyuk defeated Gracheva 6-3 7-5, after converting on match point, collapsing on court before refusing to shake hands with the Russian.
The 20-year-old, who hails from Kiev, said at January’s Australian Open that he would not shake hands with Russian or Belarusian opponents because of the war in his country.
Kostyuk dedicated her first WTA singles title to her homeland during the trophy presentation.
“In the position I’m in right now, it’s very special to win this title,” Kostyuk said.
“And I want to dedicate this title to Ukraine and to all those who are fighting and dying right now.”
Kostyuk did not acknowledge the losing finalist in his acceptance speech.
The tournament win, the first for a Ukrainian woman since Elina Svitolina in 2021, lifted Kostyuk to No. 40 in the WTA rankings.
Among the Grand Slams, only Wimbledon has banned Russian and Belarusian players from competing, resulting in a $1 million fine on the men’s tour.
Russian and Belarusian players were allowed to play at the Australian Open this year without displaying their flag or country.
