Nishikori predicts Wimbledon 'war' with Djokovic

Serbia's Novak Djokovic in action during the fourth round match against Russia's Karen Khachanov. Andrew Boyers Reuters

Novak Djokovic claims he was treated unfairly by chair umpire Carlos Ramos during his quarter-final win over Kei Nishikori to book his spot in the final four at Wimbledon.

But having become the first Japanese man to reach the quarter-finals since Shuzo Matsuoka in 1995, Nishikori must now overturn a 13-2 career losing record against three-time champion Djokovic on Wednesday.

The win now means Djokovic will face either two-time champion Rafael Nadal or del Potro in the semi-finals. "It feels great to be back in the last four of a Slam". If there were obvious empty seats for the lunchtime encounter, with defending champion Roger Federer in action at the same time on Court One, the entertainment could not be faulted.

The first came in the second set for smashing his racket against the well-worn turf behind the baseline. "It's kind of hard to copy anything, right?"

"Today I had a tough opponent, a big challenge", said Djokovic. "I usually like to recreate something".

"I had moments where I was great, I felt like I was reading his serve, other moments where I don't know where the hell I was moving to".

The 31-year-old is known for having a bit of temper and it almost boiled over again after he was handed a warning by the chair umpire for dropping his racket on the court.

"I think it's not fair, but it is the way it is in the midst of the emotions of a match".

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" I thought it was unnecessary to get the warning". He last beat him at the semifinals of the U.S. Open in 2014, where he reached the final in his best ever performance at a Grand Slam.

It will be Djokovic's 41st appearance in a Grand Slam quarter-final and he will start favourite against Nishikori, who will be in his first last-eight at the All England Club.

"Obviously it's different coming into semi-finals this year, taking in consideration 15 months behind, what everything that has happened, my results that were not up to the standard that I was doing before, that I was expected to play on", he said.

"I just had to go back to the basics and just try to get comfortable with my game and try to gain as much confidence as possible through match play".

After serving his way to a 2-1 lead in the third set, Djokovic ramped up his efforts and was met head-on with Nishikori's increase in tempo, but the No. 24 seed missed three break points at 2-2 and was soon trailing.

"He was pumping himself up".

"After that he was playing better". I'm sure he's in good shape again.

"You're saying in the point if I toss my racket like this I'm ruining the court?"