PARIS, June 2 -- Roger Federer and Rafael Nadal discovered an easy path into the men's singles quarterfinals, but Federer's compatriot Stan Wawrinka battled through a five-hour five-setter to knock Greek promise Stefanos Tsitsipas out of the French Open here on Sunday.

Federer reached his 12th quarterfinal at the tournament with a 6-2, 6-3, 6-3 win over Argentina's Leonardo Mayer, also becoming the oldest man to reach the quarterfinals at a Grand Slam since Jimmy Connors at the 1991 US Open.

"Big serving, windy, it was a tough condition. We didn't have many baseline rallies. Either one was always pressing and the other guy was defending," Federer commented.

Nadal, bidding to win a record-extending 12th French Open title, swept another Argentinian Juan Ignacio Londero 6-2, 6-3, 6-3.

"It's a very difficult day. Very windy out there. So it's not easy to find the feelings. But with that condition, I think I did a lot of things well," said Nadal. "He's good and very intense. Good shots from the baseline. Very aggressive."

Nadal will next face Japanese No. 7 seed Kei Nishikori or Frenchman Benoit Paire, whose duel had to be suspended due to darkness.

Federer and Nadal are just one match away from their 39th career head-to-head in semifinals.

But prior to that, Federer had to eliminate in-form Wawrinka, who registered an epic victory of 7-6 (6), 5-7, 6-4, 3-6, 8-6 over Tsitsipas in five hours and nine minutes, concluded by his backhand on the baseline and was called "in" by the umpire afterwards.

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