Having just secured his maiden French Open quarterfinal spot, Jo-Wilfried Tsonga threw the gauntlet down to world No 1 Novak Djokovic on Monday but did not exactly sound full of confidence.

The French fifth seed spent just 26 minutes on court on Monday to wrap up a 6-4, 7-6 (6), 3-6, 3-6, 6-4 fourth-round win against Swiss 18th seed Stanislas Wawrinka after the match was interrupted by dusk on Sunday.

"I have the feeling I spent more energy today in four games than yesterday," Tsonga told a news conference after he set up a last-eight showdown with Djokovic.