Ranked No. 152 with a protected injury ranking, Coric is the lowest seed to ever reach the final in Cincinnati.
Tsitsipas reached the semifinals for the third straight year, but it’s his first final after losing in the semis each of the past two years. Tsitsipas defeated Medvedev for the third time in 10 meetings.
Coric says he’s realistic about his chances on Sunday.
“He’s a big favorite in the final tomorrow, obviously,” Coric said. “I’ve done everything that I could this week. More than I expected. I’m just going to go out there and enjoy myself tomorrow.”
The Associated Press contributed to this story.