Wimbledon 2018 -- Juan Martin del Potro reaches quarterfinals

Argentina's Juan Martin Del Potro in action during the fourth round match against France's Gilles Simon. Toby Melville Reuters

A great quality of tennis, especially in the last set, some wonderful points, .

Juan Martin del Potro had to fight hard to beat France's Gilles Simon. However many times he's lost to Djokovic in the past-and that includes the 2011 Wimbledon final-he's now No. 1 and coming off a major title in Paris, while Djokovic is still climbing his way back up the charts. But he blew those three set points, the last with a double-fault he later called "a big mistake". "Hopefully I can maintain that".

After the match, Nadal and del Porto embraced.

"Rafa is a fighter and he has a fantastic game". It has dramatically boosted the sometimes fragile self-belief of one of the game's most amenable souls.

"Rafa is a fighter".

"I'm sorry for him, of course", said Nadal. It is timed for release as the anticipation crests with Roger as returning champion, 10 years after their famed 2008 Wimbledon championship - an epic match so close and so reflective of their competitive balance that, in the end, the true victor was the sport itself.

"I think I will be in good condition". The only negative thing is I played nearly five hours, and I had the chance maybe to play less winning that second set. I wanted to stay there for all night long.

"It's starting to come together for me".

The 32-year old Anderson defeated defending champion Federer in a five-set thriller that lasted slightly more than four hours.

It was not as if Nadal was playing badly.

"Of course I was anxious when I lost the second set", Nadal said.

It was as if that out-of-the-blue news threw the Spaniard off his stride and he fluffed his lines to drop his serve.

At two sets to one down, the prospect of Nadal and Federer exiting a grand-slam tournament on the same day for the first time was becoming real.

Nadal, the No. 2 seed, won the first set before dropping the second to his Argentine counterpart.

One such chase left Nadal toppling into the arms of a stunned woman sitting in the front row as he failed to put on the breaks as he dashed after a Del Potro smash.

I know in the semi-finals of Wimbledon you will not have an easy opponent.

There was, however, one consolation for Del Potro who came off second best despite belting down 33 aces and producing 77 staggering winners, 10 more than Nadal.

Champion in 2008 and 2010, Nadal will face off with Djokovic for a record 52nd time on Friday after the Serb earlier ended Kei Nishikori's campaign with a controversy-laden 6-3 3-6 6-2 6-2 triumph over the Asian ace.

The roaring Centre Court fans who gave him a standing ovation would not disagree.

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