PARIS, France (AFP) — Roger Federer set up a mouthwatering French Open semi-final clash with Rafael Nadal when he defeated Stan Wawrinka in four sets yesterday to become the oldest men’s Grand Slam semi-finalist in 28 years.

The 37-year-old Swiss beat his compatriot 7-6 (7/4), 4-6, 7-6 (7/5), 6-4 to reach his 43rd major semi-final and eighth at Roland Garros.

Defending champion Nadal, bidding for a 12th title at the French Open, blitzed a weary Kei Nishikori 6-1, 6-1, 6-3.

Federer trails his head-to-head record with Nadal 23-15 — despite winning their last five matches — and 13-2 on clay.

The Spaniard has a 5-0 stranglehold over Federer at Roland Garros with Nadal winning their most recent Paris clash in the 2011 final.

“The complete dream would be to win the tournament,” said Federer. “Other players won’t agree. It will be difficult, but I believe it anyway.”

The 20-time Grand Slam champion is the oldest man to make the semis at one of the big four tournaments since Jimmy Connors at the 1991 US Open aged 39.

Wawrinka saved 16 of 18 break points in a thrilling encounter, but Federer quickly finished off the match after a rain delay to progress.

It is the third seed’s first appearance at the French Open since 2015 after taking time away from clay to focus on Wimbledon, but he has been in fine form in Paris and has only lost one set so far — as has Nadal.

Nadal, who turned 33 on Monday, is three behind Federer in the all-time list of Grand Slam singles titles heading into their 39th career clash.

It will be Federer’s first Roland Garros semi-final since a defeat by Novak Djokovic in 2012.

The 2009 French Open champion struck 53 winners yesterday, as Wawrinka’s 61 unforced errors proved costly.

Nadal took his record in Paris to 91 wins and just two defeats in a one-sided contest with Nishikori to reach his 31st Slam semi-final.

“It’s a great satisfaction to be in another semi-final, there are lots of emotions,” said Nadal.

“My level has been very good throughout the tournament and I am happy to be able to come back and play another day.”

Yesterday’s win was Nadal’s 11th in 13 meetings against Japanese seventh seed Nishikori, who had played back-to-back five-setters to reach his third quarter-final at Roland Garros.

He had spent four more hours on court than Nadal and the efforts took their toll as he needed treatment on an upper right arm injury after the second set.

The 29-year-old Nishikori managed just nine winners in total in the first two sets.

As the skies darkened over the city, so did Nishikori’s mood as he slipped 1-4 down in the third and again needed the trainer to attend to his arm.

Johanna Konta became the first British woman in 36 years to reach the semi-finals by sweeping past seventh-seeded Sloane Stephens of the United States, last year’s runner-up, 6-1, 6-4.

The 28-year-old Konta had not won a match at Roland Garros in any of her previous four visits.

But now she has emulated Jo Durie who was the last British woman to make the French Open semi-finals in 1983.

She will play either Czech teenager Marketa Vondrousova or Croatian 31st Petra Martic for a place in Saturday’s final.