Novak Djokovic on Monday became the first man to reach the French Open quarter-finals for 10 successive seasons while Kei Nishikori will face the toughest challenge on a clay court — Rafael Nadal.

Top seed and world number one Djokovic continued his bid to hold all four Grand Slam titles simultaneously for the second time by thrashing Germany’s Jan-Lennard Struff 6-3, 6-2, 6-2.

The 32-year-old will now face fifth seed Alexander Zverev in what will be his 13th appearance overall in the quarter-finals in Paris.

“It was tricky with the rain, but that’s Paris,” said the 2016 champion after playing in drizzly conditions. “I’m really confident with my serve. I hope it continues like that.”

Only Australian great Rod Laver has held all four majors at the same time twice before, after his calendar Grand Slams in 1962 and 1969.

German fifth seed Zverev reached his second successive Roland Garros quarter-final with a 3-6, 6-2, 6-2, 7-6 (7/5) win over Italy’s Fabio Fognini.

Last year he achieved his best run at the Slams, making the quarter-finals where he was defeated by eventual runner-up Dominic Thiem.

“Fabio is playing the best tennis of his life,” said Zverev.

Zverev is 2-2 against Djokovic in his career but won their only meeting on clay in the Italian Open final in 2017 in straight sets.

Fognini, the ninth seed, hit 53 unforced errors as his game fell to pieces.

Japanese seventh seed Nishikori came back from 1-4 and 3-5 down in the final set to beat Benoit Paire of France and set-up a quarter-final clash on Tuesday against Nadal.

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 match at the French Open.

The 29-year-old Japanese could have wrapped it up in the fourth set when he had two match points but 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 Spaniard, celebrating his 33rd birthday on Monday, has won all four of their meetings on clay.

For Paire, it was an opportunity lost.

French interest in the singles ended for another year just a few hours later when 14th seed Gael Monfils was defeated 6-4, 6-4, 6-2 by Austrian fourth seed Thiem, the 2018 runner-up.

Thiem will be playing in his fourth successive quarter-final in Paris where he will face either 10th-seeded Russian Karen Khachanov or two-time semi-finalist Juan Martin del Potro.

Defending women’s champion Simona Halep reached her fourth French Open quarter-final with a 45-minute thrashing of Polish teenager Iga Swiatek. The Romanian third seed raced to a 6-1, 6-0 win, dropping only one game when serving for the opening set as Swiatek failed to hold serve in the match.

Halep will face either American 17-year-old Amanda Anisimova or Spain’s Aliona Bolsova for a semi-final place.

The players who stunned top seed Naomi Osaka and 23-time major winner Serena Williams got a taste of their own medicine.

American 14th seed Madison Keys reached the quarter-finals for the second successive year with a 6-2, 6-4 win over Katerina Siniakova, the conqueror of US and Australian Open winner Osaka. Keys next faces Australian eighth seed Ashleigh Barty.

Barty beat Sofia Kenin, who stunned Williams in the third round, 6-3, 3-6, 6-0.

Agence France-Presse