Novak Djokovic looked back to his best on Wednesday after clinching a spot in yet another Wimbledon semi-final.

The Serbian was in fine form as he overcame a spirited Kei Nishikori on Center Court as his comeback from injury continues to go from strength to strength.

Djokovic spent a lot of time on the sidelines recovering from a dreadful elbow injury that had many fans worrying that he may never return to his scintillating best.

However, his fantastic run to the Wimbledon last four has gone a long way to quashing those fears and now he looks set to return to the top of the game.

However, while Djokovic appeared to cruise through his tie with Nishikori, it wasn’t entirely smooth sailing.

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

Having already been critical of what he described as unfair treatment from the Wimbledon crowd during his clash with Kyle Edmund, Djokovic was less than impressed with the umpires decision.

“I thought it was unnecessary to get the warning,” he told the BBC after the 6-3 3-6 6-2 6-2 win.

“I didn’t harm the grass. I know how I threw the racquet.

“He even threw the racquet in the fourth set and the chair umpire says he didn’t see him. I get the warning, he doesn’t – it’s not fair.

“But it is the way it is in the midst of emotions and tough matches it happens.”

Djokovic was seen engaged in a heated discussion with the umpire in the aftermath of the warning and it is fair to say some of his comments and complaints have left a sour taste in the mouth of some Wimbledon punters over the course of the championships.

The Serb only got his chance to play on Center Court after complaining about how much time Roger Federer was getting to spend in the famous arena.

However, should he make Sunday’s final and win it, he probably won’t care that he isn’t exactly a fan favourite.