Rapid hold from Nadal, his young opponent throwing his hands to the air in a futile chase for a line-seeking forehand. Kyrgios is once again asked to once again serve to stay in the set, a task that was beyond him last time.

Image source, Reuters

Rafael Nadal has no right to win this point, pulled to the net, then pushed to the baseline only to belt a forehand on the turn. Kyrgios nets for 15-30, but once again his serve returns control of the game. When Nadal finds the fish-catcher, we stay on serve.

Camilla Halewood:, external Good on Kyrgios for not letting Nadal slow down his own service games. I would serve while he's still fiddling with his knickers!

The Nadal fist pumps are becoming a little more regular now, this time a backhand down the line is worthy of a belt to the air. Kyrgios, his height only rivalled by a huge ballboy behind him, remains in the game, though, and scampers for 30-30. Nadal screams when he regains the advantage, but the two-time champ is pulled to all corners for Kyrgios to earn deuce. That's his lot, though, Nadal battles through to hold.

Sabine Lisicki:, external Fought with all my heart out there and won!!! #sometimesyouneedluck #quartersagain #bestfansintheworld @Wimbledon.

The Nick Kyrgios serve is like a crossword puzzle Rafael Nadal can't complete. Every time the world number one looks like he might be on the verge of a breakthrough, Kyrgios come up with a whirlwind hold in which Nadal barely has a shot.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

"Kyrgios does not seem bothered about anything, it's more mental fatigue than anything but to keep up this pace against a guy this good is difficult."

You just sense that Rafael Nadal has had enough of his opponent's theatrics and is now turning up the gas. Cracked forehand, spitting serve and an arrow that Kyrgios can only send long mean Nadal sits on a 3-2 lead. The crowd take the opportunity to stand, stretch the legs, while Nadal lines his water bottles like soldiers. Shadows start to creep from right to left as we head in to the evening.

Image source, Getty Images

Andy Murray will have second use of Centre Court tomorrow, very roughly around 13:30 BST.

The defending champion takes on Grigor Dimitrov once Simona Halep and Sabine Lisicki are finished on the showpiece stage.

Stan Wawrinka and Roger Federer are last on. We start at 12:00 BST, an hour earlier than usual, to cram it all in.

The full order of play is up on the BBC Sport website for you to work your day around.

Kyrgios, tall enough to shake hands with those in the front row of the Royal Box, whallops his serve down from sunshine to shade. When Nadal manages to engage the youngster in a conversation, the ball is sent long. 40-30. "Come on Aussie" say a few voices in the crowd, but Kyrgios is wide for deuce. Creaking? Not really. Ace, followed by an unreturnable. We stay on serve.

Tom Fordyce
Chief sports writer at Wimbledon

"Nadal's prolonged celebrations on sealing that second set tell you everything about how close he feared he was to losing it. For the fourth match in a row in these championships he has come from a set down, and the 19-year-old wildcard Kyrgios must lift himself to new levels to reverse the momentum from here."

Image source, Getty Images

Kyrgios, gold chains dangling from his neck like a West Indian fast bowler, waits in the only part of Centre Court covered in shade as the the racquet-twiddling Nadal bites his lip in serving up his left-handed curlers. Routine hold, the two-time champ really warming to his task.

How will he respond? By doing what he's been doing for the best part of two hours. The serve remains formidable, the movements fluid, the force strong enough to continue to force Nadal errors. Hold to love.

Image source, AP

Stan Wawrinka on playing fellow Swiss Roger Federer in the quarter-finals: "When you play Roger at Wimbledon, when he's fit and confident and feeling well, it's one of the biggest challenge in tennis.

"It's like playing Rafa in the French Open. Those guys are playing their best tennis since many years.

"When you go on court, you need to trust yourself, you need to go for it. We have played so many times. Last time I won but lost all the ones before, so it's going to be an interesting match."

Nadal has new nuts on his strings at the start of the third. More in control of his serve now that at any other time during the match, the only crumb given to Kyrgios is a wild forehand. Kyrgios, looking deflated, loses the game with yet another forehand dumped in to the net. How will the world number 144 respond to being broken for the first time?

Pat Cash
1987 Wimbledon champion on BBC Radio 5 live sports extra

"Terrific set, great play from Nadal to scramble the ball back enough times, and Nadal did what Nadal does well to give himself a chance."

Image source, Getty Images

The first pump and the cheers tell you all you need to know. With the benefit of an inviting netchord, Nadal takes control, with Kyrgios eventually able to do more than put the ball at the bottom of the net. That's the first time in the match the Aussie has been broken, allowing the world number one to level. The crowd rises, Nadal delivers an air punch that would floor Carl Froch. We're back on terms.

When, oh when will the Kyrgios serve let him down? Will it ever happen? Ace to save the set, Nadal into the net to surrender the advantage. Nadal, though, is nothing if not resourceful. Trickery, scampering, Kyrgios pulled this way and that. When Nadal keeps in another point long enough for Kyrgios to go wide, it's a second set point...

Ah, have we seen the first signs of a Kyrgios crack? A dump in to the net, a backhand long, Nadal two points from the set. An Aussie to be broken? Not yet. Forehand takes us to 30-30, but another dump in to the net gives Nadal set point...

Kyrgios is a showman. Even on the practice court yesterday morning he was playing up to an imaginary crowd. When he's not in a point, he'll flop the racquet in to an obscure place - behind his back, between the legs - contact with the ball is a bonus. Once more he catches the eye even in losing a game, a backhand down the line the only blot on Nadal's hold to 15.