Holger Rune moved into the quarterfinals of the BNP Paribas Open with a 6-4, 6-4 win over Stefanos Tsitsipas on Tuesday at Indian Wells, California.
Rune, the No. 12 seed, played the aggressor throughout his encounter with Tsitsipas to end the Greek's seven-match winning streak and reach his ninth Masters 1000 quarterfinal.
Rune delivered the shot of the tournament to stave off a break point in the second set when he launched an arcing "tweener" from behind the baseline, sending the ball to the opposite baseline that an outstretched Tsitsipas was unable to retrieve.
"I stayed very committed on my game plan, and mentally I was very good," Rune said. "I think that made the difference, how composed I could start. Because Stef is back in shape, I think it is fair to say. It was a cool battle."
Rune will next face Tallon Griekspoor, who beat Japanese qualifier Yosuke Watanuki 7-6 (4), 6-1 earlier Tuesday to reach his first Masters 1000 quarterfinal.
In the evening session, Daniil Medvedev defeated local hope Tommy Paul 6-4, 6-0 in a late-starting match after several rain delays throughout the day.
Medvedev needed only 12 minutes to claim the opening four games and recovered from a brief dip during the roller-coaster first set to ease through.
A double break in the second set gave the No. 5 seed the momentum he needed to close out the victory and book a quarterfinal matchup with Arthur Fils, who got past Marcos Giron 6-2, 2-6, 6-3.
Reuters contributed to this report.