(CNN)Daniil Medvedev appears to be relishing the role of US Open villain.
For the third match in a row, the No. 5 seed needed four sets to advance. And for the second time in two days, the Russian agitated the crowd at Louis Armstrong Stadium.
On Sunday, Medvedev defeated German qualifier and 118th-ranked Dominik Koepfer 3-6, 6-3, 6-2, 7-6(2) in two hours, 32 minutes to reach his first major quarterfinal.
While it was clear that Koepfer had his supporters, the atmosphere was calm. That changed when Medvedev won match point. It was then the 23-year-old Russian started strutting, which riled up the crowd.
He went on to point his arms skyward, gesturing for more from the fans.
Medvedev, who was seen wearing kinesio tape on his arm, shoulder and legs during the match, said to the crowd, "I was painful in my abductor before the match. I thought I'm not going to play. I was painful in my shoulder. I took as much painkillers as I could. And you guys, being against me, you gave me so much energy to win. Thank you."
The crowd continued to jeer.
"Guys, continue to give me this energy," Medvedev said. "You're the best."
Medvedev next will face either world No. 1 Novak Djokovic or No. 23 seed Stan Wawrinka in the quarterfinals.
"After the match, I engaged a little bit with the crowd," Medvedev said to reporters. "But we all know how New York crowd can be. It's probably the most electric crowd in the world, I think. Especially, I mean, playing this week on big courts, I could feel it. Today I was just engaging with the crowd and hopefully