The Pole early withstood the best blows of the second number of the world to win in a difficult starting set with a score of 7-6 (7), before disarming Medvedev spectacular game in the net to get a second 6-3.
In comments on the ATP Tour website the 10th world number after the match said the humidity helped him cross the border.
“I spent a lot of time in Florida, so I got used to the humidity,” he said.
“I think the conditions were in my favor today, so I tried to take advantage of them.
“I think the return was crucial. I managed to make a lot of rebates and get some free points on my serve because arranging the draw with Daniel is fun, but they linger. It’s good that I managed to get some free points. “
In the semifinals Gurkac will meet Spaniard Carlos Alcaras, who beat Serbian Miamir Kecmanovic 6-7 (5) 6-3 7-6 (5).
Meanwhile the former first racket of the world Naomi Osaka returned from a match against Belinda Bencic and reached the fourth final of her WTA 1000 career.
Although Bencic went out of the goal with excellent kicks, Osaka found their serve in the second when she sent 18 aces on the road to victory with a score of 4-6 6-3 6-4.
She will meet the world’s first racket Iga Sviatek in the final after the polka defeated American Jessica Pegula 6-2 7-6 in the semifinals.