'Can't believe it': Roger Federer stuns Wimbledon with 'insane' moment

One particular moment in Roger Federer’s quarter-final win over Kei Nishikori at Wimbledon had the tennis world in awe.

The eight-time champion sealed his place in the semis for a 13th time with an historic 100th win at the All England Club, a 4-6 6-1 6-4 6-4 victory.

The Swiss legend had to battle back after losing the first set, eventually prevailing in four.

And an incredible winner in the fourth set had fans on their feet and commentators searching for superlatives.

Nishikori had Federer scrambling from one side of the court to the other and appeared to be destined to win the point.

Roger Federer produced an unreal winner. Image: Wimbledon/Getty

The Japanese star pushed a nice backhand slice into Federer’s backhand side before moving in to the net.

However he was left completely stunned when Federer - on the run - rifled a crosscourt backhand straight past him to win the point.

Nishikori could only bow his head in defeat.

“Oh brilliant!” one commentator exclaimed. “That was outstanding.”

Boris Becker added: “I’m amazed by the speed and the footwork of the 37-year-old.”

Fans in attendance rose to their feet, while those watching at home took to social media in awe.

Federer and Nadal in dream showdown

Federer and Rafael Nadal are now preparing for a mouth-watering sequel to their "Strokes of Genius" showdown after setting up a box-office semi-final on Friday.

The last time they collided at Wimbledon more than a decade ago, script writers turned the so-called greatest match of all time into a movie.

After Federer’s win, Nadal confirmed a 40th instalment of their compelling rivalry with a 7-5 6-2 6-2 dismissal of Sam Querrey.

The two tennis titans haven't clashed at Wimbledon since Nadal denied Federer 9-7 in the deciding set of their epic 2008 final to claim the first of his two crowns on London's famous grass court.

"It's great. It's difficult to imagine again being in that situation," Nadal said.

"Excited to be back on this court against him after 11 years. Means a lot for me and probably for him, too.

Roger Federer and Rafael Nadal after the 2008 final. (Photo by Sean Dempsey - PA Images/PA Images via Getty Images)

"I just expect to play against probably the best player of the history in this surface and know that I have to play my best if I want to have chances to try to be in that final.

"I know he's playing well. He feels comfortable here. And me, too. I'm playing well, too."

The two most successful men's performers in grand slam history will be going head to head at a major for the 14th time.

But in a first at Wimbledon, Federer and Nadal won't be playing for the trophy - not that that changes too much, or reduces the stakes.

"We have a lot of information on Rafa, as does he on us," Federer said after becoming the first man to notch a century of wins at Wimbledon and advancing to a mind-boggling 45th grand slam semi-final in all.

"So you can dive into the tactics like mad for two days, or you say 'it's grass court tennis so I'm going to come out and play my tennis'.

"People always hype it up. It was a joy to play against Rafa again on his court at the French Open (last month) and I'm very excited to play him here."

with AAP