Tom Fordyce
Chief sports writer at Wimbledon

"Nerves? Not a bit of it. Nick Kyrgios looks entirely unflustered by either his Centre Court debut or his 14 Grand Slams to the good opponent. He lost only four points on his serve in that first set; the challenge now is to not only maintain that level but to stand tall against the inevitable Nadal fight-back."

Unsurprisingly, Kyrgios bounced out of his seat, ready to receive the Nadal serve long before the umpire called "time". What has the world number one got in response?

Shohidur Rahman:, external Nadal should wear Balotelli's shirt that says "Why always me?" Another player producing inspired tennis against him.

SmashTheSilence:, external Kyrgios is playing astonishingly well. It's like he's not nervous at all! Wonder if Nadal has any answer at all.

Virginia Wade
1977 Wimbledon champion on BBC TV

On Serena Williams's withdrawal from the doubles because of illness: "It's very disappointing because it is a few days since Serena lost to Alize Cornet and she has stayed around to play doubles with Venus. But I don't know how she could have played this match when she was feeling so unwell."

Image source, Getty Images

Serena Williams has been forced to retire through illness in her doubles match with sister Venus against Stefanie Voegele of Switzerland and Germany's Kristina Barrois.

Serena needed lengthy treatment from the doctor and trainer after the warm-up but decided to start the match.

But on her first service game with her and Venus down 0-2 she served four double faults and was unable to take any further part. Barrois and Voegele go through to the third round.

Boom! It was only fitting that Nick Kyrgios would hammer down an ace to win the first set - it is his huge, elastic serve that has dominated this first set. Rafael Nadal has lost the first set in each of his previous three games in this Championships, so we're not in new territory, but he really had no idea of how to deal with that Kyrgios weapon. Shock alert?

Wide from Kyrgios, then a Nadal ace. Two saved, but now it's Kyrgios to serve.

Image source, AFP

Kyrgios, an olive-skinned man mountain, is all fist pumps and screams as he wrong-foots Nadal, following that up with an ace to earn three set points...

Nadal gets a mini-break back when Kyrgios explores the tramlines, calling for his towels as the players change ends. He'll need to find another way of taking something of the Aussie serve if he's to get back in this breaker, but for now keeps his own of the bargain. Balls back with Kyrgios.

Do you fancy Kyrgios here? The Aussie has been the one holding with comfort throughout this set. He serves first, winning the point, before a mammoth baseline rally follows on the Nadal serve. Nadal pushed further and further back, Kyrgios whipping forehands, before Nadal can take no more. Another mini-break has Kyrgios entirely in charge at 3-0.

My word, Nick Kyrgios is a blade of grass from winning the first set. A backhand return winner gives him a first set point, with a following forehand only proved to be long by the tiniest of margins. From there, Nadal forces the tie-break, but he's been put on warning.

Image source, Reuters

Superb comeback from Milos Raonic against Japan's Kei Nishikori means he joins his fellow Canadian Eugenie Bouchard in the last eight at Wimbledon 2014. No Americans have made it that far, remember. A grand total of 35 aces to 11 tells the story of the match, with Raonic dominating on serve, including one brute of a delivery that measured 141mph on the speed gun. Almost too fast for the human eye and when you throw in 66 winners it's no surprise that Nishikori couldn't keep pace with the Canadian.

Nadal has to fight with fire to come from 0-30 down when serving to stay in the set. A jackhammer into the body, a race to the net to put away a forehand. 30-30. Huge point coming up. Can Kyrgios force a set point? Both players scampering, side to side, Kyrgios blinking by going long. Repeated next time, but this time Nadal is in to the net. Deuce. Big moments.

Tim Henman
Former British number one on BBC Two

"If this was boxing you'd feel like Kyrgios was a long way ahead on points, but it is going with serve and although Kyrgios is playing mighty well he does not have anything to show for it just yet."

Can someone check the balls to see if they're OK please? Nick Kyrgios is punishing the fluffy spheres - forehand, serve, ace, ace. Hold to love, then a heel-kicking dance to his chair. This is a man who likes the big stage.

Image source, PA

Centre Court, a smorgasbord of natty headwear to shield from the burning sunshine, doesn't quite know what to make of this Kyrgios assault. There's the odd "come on Rafa" after Kyrgios walks his way to a backhand winner. Still, Nadal is looking more at home with the balls on his racquet now and a favourable netchord allows a easy put-away, with an ace taking us to overtime.

Maria Sharapova on who might win Wimbledon now she and Serena Williams are both out:

"It's tough to think about who might win. Just because you come in as a favourite doesn't mean you are guaranteed to hold the trophy. People anticipate certain matches but results don't always turn out that way."

Kyrgios, the man with the bazooka on his shoulder, toys with Nadal for 40-0. Nadal, though, has played with bigger guns in winning 15 Grand Slams. He finally gets a look at how Kyrgios will respond when he gets the ball back, but another Kyrgios whopper means Rafa will serve to stay in the set.

Maria Sharapova on whether there's a shift of power in women's tennis:

"The Grand Slam champions so far this year are Li Na and myself and we've both won before, but there is a shift in that there's a new generation playing well against top players at Grand Slams but as to winning them, I think that is yet to be determined."

There seems to be drama on Court One with Serena Williams suffering from illness. The match was set to begin but Williams has the trainer and doctor in attendance. She and sister Venus are due to face Kristina Barrois and Stefanie Voegele in the doubles.