Novak Djokovic roars with delight after marching into Wimbledon semi-final

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

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

Novak Djokovic returned to a grand slam semi-final for the first time since 2016 after recording a hard-fought win over Kei Nishikori at Wimbledon.

"To be honest, I thought it was unnecessary to get a warning".

World number one Rafael Nadal takes on Argentine Juan Martin del Potro directly after Djokovic's match on Centre Court, and Brit Andy Murray, who misses the tournament through injury, cited the decision to have two games staged back to back was the correct one.

"So I think it's not fair but it is the way it is, in the mix of emotions and a tough match it happens".

It will be Djokovic's first semi-final at a major since the 2016 French Open when he completed the career Grand Slam.

At the start of the second, Djokovic was putting Nishikori under huge pressure again, but the Japanese held firm on serve in a 10-minute game.

Nishikori promptly broke serve and then held to go 4-1 up before levelling the match at 1-1 but any sense of a fightback, and the possibility of a first Japanese man in the Wimbledon semi-finals since 1933, was short-lived. "I've been building in the last couple of weeks and my level of tennis is going up", he said.

'I'm pleased I'll be staying there right now'.

Forced to fight back from 15-40 down, Djokovic saved a set point and showed a quick pair of hands to swap onto his forehand from left court and fire across Nishikori and into the last four of the competition.

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

The 2011, 2014 and 2015 champion was clearly unsettled by the dispute, quickly surrendering the set.

With his 24th seeded opponent saving three break points to hold serve at 2-1, Djokovic bounced his racket off the baseline in frustration and then seethed after he was given a code of conduct warning.

Japan´s Kei Nishikori returns against Serbia´s Novak Djokovic during their men´s singles quarter-finals match on the ninth day of the 2018 Wimbledon Championships.

Djokovic's mood was not improved by Ramos choosing not to punish Nishikori for imitating his earlier offence of bashing a racquet into the ground.

"Double standards, my friend".

The Serb has looked in impressive form over the last week and was too strong for Nishikori, who was competing in his first quarter-final at the All England Club.