No sign of a Strycova comeback early doors as she has a fresh air shot at Kvitova's serve. But she fights back to force a deuce only to be outhit but an inspired Kvitova. Superb from the 2011 champion, who is well one her way to the last four.

Kvitova is returning serve with interest and here we are at deuce. Set point now - and Strycova loops long to hand her fellow Czech the set in just 36 minutes.

Image source, EPA

Rafael Nadal after losing to Australian teenager Nick Kyrgios: "When you have nothing to lose you can play the way he did today. When you are playing in the last rounds, it is harder to hit 140 mph second serves. For him the next round for me the beach.

"My draw was not the best against a lot of players who cannot give you a chance to play very much. I am not upset that I lost today."

Rafael Nadal after losing to Australian wildcard Nick Kyrgios in four sets: "When you have an opponent who decides to hit the ball really strong and serve like that you are in trouble. I don't think that I played badly.

"I hadn't seen him playing on the other surfaces, grass is only two three tournaments a year but when you serve that big you will always have a chance.

"I don't know if he is a guy I will keep meeting the sport is a mental battle at a times, he has all the qualities but things are always a little easier when you are just arriving.

"When you are there for a while people start to see the negative things about your tennis. We will see if he can stay at the top level but I wish him all the best."

Left-hander Kvitova, competing in his fifth consecutive Wimbers quarter, is pegged back from 30-0 to 30-all, and from 40-30 to deuce. But she polishes off with a drive volley to leave Z Strycova serving for the set.

Kvitova opens up three break points with ease but wastes the first with a backhand into the net and somehow loses the second when Strycova retrieves two smashes. From deuce, Kvitova earns a fourth break point in a stonking rally and seals the double break with a neat backhand pass.

Pat Cash
1987 Wimbledon champion on BBC Radio 5 live

Image source, AFP

"There's no doubt this win is a window to the future. I didn't think Nick would break through so well at this tournament even though we had high hopes and expectations of him.

"I don't know whether he can regroup to beat Milos Raonic - it reminds me of Philippoussis beating Sampras at the Australian Open and the emergence of Boris Becker.

"Every country needs a Nick Kyrgios - he has personality and character. We as Australians have been lucky to have champions over the generations and now it looks like we may have another one."

Tracy Austin
Two-time Grand Slam champion on BBC TV

"In a big situation like this in the quarter-finals of a Grand Slam, you just have to stay inside the rectangle of the court. You have to think about your strategy and don't think about who's watching or who isn't."

Kvitova, her shock of blonde hair flapping in the breeze, produces a flawless service game to steam further ahead.

Strycova, a former world junior champion, is already in unchartered territory in a Grand Slam. And she's struggling to settle down on her serve here, saving two break points before scraping over the line when Kvitova nets.

Kvitova doesn't pass up the second opportunity, forcing Zahlavova Strycova to net. She's backed up her break, all business late in the evening. Sam Sheringham is here to talk you through the next passage of play.

Image source, AP

The winner of this match will play Lucie Safarova in the semi-finals, which means a Czech player is guaranteed to be in the final. Zahlavova Strycova, the text commentator's nightmare, has beaten second seed Li Na as part of this best ever run at Wimbledon and earns a break-back point via a long Kvitova forehand. The former champ battles back and wastes the chance to wrap up the game with another long forehand. On we go.

Kvitova, the 2011 champion, has heavy strapping on her right thigh, but has started well against her Czech compatriot. In front of a barely half-full Centre, Kvitova is in for a forehand winner and two breaks points, the second of which is taken thanks to a Zahlavova Strycova shank.

Ian Rhodes:, external Great to see that we are starting to see some unpredictability in tennis. Great performance for Kyrgios

Ros Clarke:, external I can easily see Kyrgios making the final. Raonic and then Wawrinka or Federer. Can't see any of them stopping him.

Liam Bere:, external Kyrgios was absolutely awesome! Brilliant serve and held his nerve throughout. Real star in the making.

After Angelique Kerber's win over Maria Sharapova, we asked how it could be followed. Well, Nick Kyrgios gave us more and then a little bit extra on top. What can Petra Kvitova and Barbara Zahlavova Strycova provide by means of a dessert in this three-course Centre Court feast?

The players are out and ready to battle for a place in the semi-finals. Zahlavova Strycova has the balls on her racquet.

Tracy Austin
Two-time Grand Slam champion on BBC TV

Image source, Getty Images

"The maturity Kyrgios has shown in six months is amazing. We are now seeing a changing of the guard. We have been waiting for Milos Raonic to come through and we expect big things from him and Grigor Dimitrov and it is very exciting."

John McEnroe
Three-time Wimbledon singles champion on BBC TV

"I think we have found the next guy in the men's game. I couldn't believe that he could keep that up all match. He had this feeling about him that he absolutely believed that he would win.

"He is acting to me like he can win the whole tournament. The last guy that I saw like that was Boris Becker, a teenager who just believed that he would beat everything that was put in his way.

"To lose the second set and still win pretty decisively in four was just magnificent."

Kyrgios served 37 aces, part of a serving performance that saw him win 81 out of 98 points when the Aussie got the first serve down the other end.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

Image source, AP

"Not only is he not surprised to have beaten Nadal. I sensed that he had that feeling and Nadal felt it and you know you are watching a big star of the future."

Tracy Austin
Two-time Grand Slam champion on BBC TV

"Sometimes it is great to be young and fearless. He wasn't thinking about anything else but what maturity he has shown in just his second Grand Slam. He went after the match - it wasn't as if Rafa gave it to him."