Updated On: 18 May, 2019 12:00 AM IST | | AFP
Tsitsipas advanced after Federer -- returning to clay after a two-year absence -- retired with a right leg injury before their game

Switzerlands Roger Federer wipes his face during his ATP Masters tournament tennis match against Portugals Joao Sousa at the Foro Italico in Rome on May 16, 2019. - World number three Roger Federer pulled out of the Italian Open before his quarter-final m
Defending champion Rafael Nadal swept into the last four of the Italian Open on Friday as Roger Federer and Naomi Osaka both pulled out injured just a week before the start of the French Open. Eight-time champion Nadal came through 6-4, 6-0 against fellow Spaniard Fernando Verdasco to set up a rematch with Greek rising star Stefanos Tsitsipas for a place in the final.
Tsitsipas advanced after Federer -- returning to clay after a two-year absence -- retired with a right leg injury before their game. "I am not 100 percent physically and after consultation with my team, it was determined that I not play," said 37-year-old Federer. For 32-year-old Nadal it is his fourth straight semi-final on clay this season, but he has not managed to go further before his bid for a 12th French Open title at Roland Garros, starting on May 26.