Greek fifth seed Stefanos Tsitsipas showed his superior clay-court quality against Russian rival Daniil Medvedev to reach the French Open semi-finals.
Tsitsipas, 22, has the greater pedigree on the surface and quickly damaged second seed Medvedev's renewed belief on the way to a 6-3 7-6 (7-3) 7-5 win.
An enjoyable match ended when Medvedev served underarm and charged forward, allowing Tsitsipas to pass for victory.
Tsitsipas will face German sixth seed Alexander Zverev in the last four.
"I was playing against one of the best guys on the tour and I had to keep up with the intensity and elevate my game," said Tsitsipas, who has dropped only one set in the tournament.