Paris - Japanese seventh seed Kei Nishikori came back from 1-4 and 3-5 down in the final set to beat Benoit Paire of France and set-up a Roland Garros quarter-final clash against defending champion Rafael Nadal on Monday.
Nishikori won 6-2, 6-7 (8/10), 6-2, 6-7 (8/10), 7-5 in a shade under four hours to reach his third last-eight clash at the French Open.
"He almost had it today," said Nishikori who had led two sets to one when the last-16 tie was suspended on Sunday.
"He served for the match at 5-3 but I just tried to fight and play one point at a time."
The 29-year-old Japanese could have wrapped it up in the fourth set when he had two match points but he squandered both, the second on a double fault.
Paire, the world number 38 who was trying to make the quarter-final of a Slam for the first time, was eventually undone by 15 double faults and 79 unforced errors.
Nishikori has only defeated 11-time French Open champion Nadal twice in 12 meetings with both of those wins coming on hard court.
The 33-year-old Spaniard has won all four of their meetings on clay.
"It's going to be a tough match, he's the greatest ever clay court player," said Nishikori.
Results from the ninth day of the French Open on Monday (x denotes seeding):
Novak Djokovic (SRB x1) bt Jan-Lennard Struff (GER) 6-3, 6-2, 6-2
Alexander Zverev (GER x5) bt Fabio Fognini (ITA x9) 3-6, 6-2, 6-2, 7-6 (7/5)
Dominic Thiem (AUT x4) bt Gael Monfils (FRA x14) 6-4, 6-4, 6-2
Karen Khachanov (RUS x10) bt Juan Martín Del Potro (ARG x8) 7-5, 6-3, 3-6, 6-3
Kei Nishikori (JPN x7) bt Benoît Paire (FRA) 6-2, 6-7 (8/10), 6-2, 6-7 (8/10), 7-5
Madison Keys (USA x14) bt Katerina Siniakova (CZE) 6-2, 6-4
Ashleigh Barty (AUS x8) bt Sofia Kenin (USA) 6-3, 3-6, 6-0
Simona Halep (ROM x3) bt Iga Swiatek (POL) 6-1, 6-0
Amanda Anisimova (USA) bt Aliona Bolsova (ESP) 6-3, 6-0