Serbia’s Novak Djokovic declared he was in Grand Slam-winning form after storming into the semi-finals at Wimbledon with a 6-3, 6-2, 6-2 victory over Taiwan’s Lu Yen-Hsun on Wednesday.

World number three Djokovic, who faces Tomas Berdych - shock conqueror of Roger Federer — in the last four, played almost faultless tennis to wrap up victory in an hour and 51 minutes on Court One as Lu, who eliminated thrice Wimbledon finalist Andy Roddick in the previous round, was blown away.

Djokovic’s serve was functioning so well Lu did not have a single break point in the three sets and the third seed now looks a serious contender to add this Grand Slam to the Australian Open title he won in 2008.

Djokovic told reporters: “I don’t know if I am able to compare my present game with when I won the Australian Open but it is definitely close.

“Right now I think I’m raising my confidence level and performance level match after match and that is very encouraging at this stage of the tournament.

“It is refreshing to perform this way after a while. I was struggling over the last five or six months. It was a lot of ups and downs.

“I wasn’t finding myself on the court — I had distractions, meaning mental discomfort on the court, and wasn’t feeling great.

“It is important to take the best out of it and continue in the right way and that is what I did. Now I’m playing great.”

The 23-year-old has had less success at Wimbledon than at other Grand Slams, although he reached the semi-finals here in 2007 when he was forced to retire from his clash with Rafael Nadal.

Djokovic was in control from the start against Lu, with the Taiwanese unable to neutralise his powerful serve. When Lu did set up an opportunity in certain, points he failed to finish it off as his forehand misfired.

But in this form Djokovic would have beaten most players on the circuit, let alone someone ranked 79 places below him.

Lu said: “He is probably happy, today’s too easy for him, but he is a great player. He controlled the whole match.

“I tried to hit harder and I started to miss. I played some good points but I had no chance. He put a lot of pressure on me so I had to force myself to serve better and sometimes I overplayed and I missed a lot of first serves.

“I can only say he was better than me. I tried my best, I tried to move him but he played better.”

Lu defended two break points in the fourth game of the first set but Djokovic made no mistake in the sixth game to engineer a crucial advantage.

The Serbian number one broke in the fifth game of the second set on his way to a 2-0 lead and broke Lu in the first game of the third set to maintain complete command of the match.

Lu, as in his match against US star Roddick, refused to throw in the towel and correctly challenged a line call, to big cheers from the crowd, in what proved to be the final game of the match.

Lu’s progression to the quarter-finals has transfixed Taiwan, with President Ma Ying-jeou congratulating the player and saying that thousands of people stayed up late to watch his matches.

The world number 82 was the longest surviving unseeded player in the men’s draw and put in his best ever performance at a Grand Slam.

He is the first Asian men’s player to reach the last eight since Japan’s Shuzo Masuoka achieved the feat in 1995 but he ran out of steam against the irresistible Djokovic.