Juan Martin del Potro set up a mouthwatering clash against Roger Federer in the quarter-finals of the French Open after beating Tomas Berdych in four sets.
The No 9 seed from Argentina won 7-6 (8-6) 1-6 6-3 7-5, to finish a match that was halted on Sunday evening due to darkness at Roland Garros.
Starting out on Monday with a 2-1 lead in sets, del Potro needed 53 minutes to wrap up the victory, as he broke the No 7 seed twice during the fourth set
In a match full of unforced errors (97) and almost as many winners (86), the Czech player was unable to out-hit the powerful del Potro, who sealed the win by breaking serve to love in the 12th game of the fourth set.
Del Potro now meets Federer, who holds an 11-2 win-loss record against the Argentine that includes a semi-final victory in Paris three years ago.
Del Potro had bad memories from last year, when he had been on top of Djokovic in their third-round match when they had to stop for darkness, and the Serb went on to win reasonably comfortably.
"I didn't have a good experience in this case," said the 23-year-old.
"But I got up this morning very positive, trying to close the match in the fourth set, and I restarted the match very focused."
Del Potro and Federer met in the semi-finals here in 2009, with the Swiss fighting back from two sets to one down to triumph and then going on to win his only French Open crown.
Del Potro famously beat Federer later the same year in the final of the US Open before wrist problems ruined his 2010 season, and he has lost all five matches between the pair since his return.
The ninth seed is confident his knee will not be an issue, and he said: "I don't want my knee to be a hindrance, and it is not a hindrance. It doesn't bother me. If I lose this match I cannot say it is because of my knee."
