Daniil Medvedev and Stefanos Tsitsipas have advanced to the quarter-finals of the Mallorca Championships.
The top-ranked Medvedev overcame a slow start in a 4-6 6-3 6-2 win over Aslan Karatsev, while Tsitsipas triumphed 6-4 6-4 against Ilya Ivashka.
Medvedev, the defending champion, improved to 8-2 on grass this season although he has lost two straight finals on the surface.
He will next face Roberto Bautista Agut, who advanced after Australian Nick Kyrgios withdrew ahead of their match because of an abdominal injury.
Medvedev, who could have meet Kyrgios in the quarters, can't play at Wimbledon this year because the All England Club has barred players from Russia and its ally Belarus over the war in Ukraine.
Tsitsipas faced no break points in his comfortable victory over 40th-ranked Ivashka.
"I felt like after my first serve, I was really able to get behind the ball and pick the right spots," Tsitsipas said.
"It was, I guess, very difficult for the opponent to be able to adjust to this. I was doing it very well. I was very dedicated to that. It was really good for me from start to finish."
The sixth-ranked Tsitsipas will next face American Marcos Giron, who defeated countryman Mackenzie McDonald 4-6 7-6 (7-5) 6-4.
Australian Associated Press
