John McEnroe
Three-time Wimbledon singles champion on BBC TV

"Kyrgios is forcing Nadal to play at his pace and he is forcing the issue. It's worth remembering that whoever wins this will have to play in a quarter-final tomorrow against Raonic."

There's one corner of Centre left in sunshine, that is where Nadal stands as Kyrgios puts another bullet in the gun. Ball up, arc back, spring in to the serve with elasticity and athleticism. One more hold, one step closer to a shock that would rock Wimbledon to its core. Nadal towels his, erm, crotch, then jogs out to try to keep pace.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

"There has been a surprising amount of misses on the Nadal forehand side. You have to had it to Kyrgios. He has got Nadal edgy but the pace of the backhand is making inroads on Nadal."

Nadal tugs at his shorts, pokes at his face, flashing wide to give Kyrgios a chance at 30-30. Baseline battlelines drawn, cross-court, but the Aussie is hitting the tape. A Nadal ace keeps him afloat.

Image source, PA

Meanwhile on the outside courts play continues in glorious sunshine and Great Britain's Neal Skupski and Naomi Broady have reached the third round of the mixed doubles with a 2-6 6-3 6-4 win over Spain's David Marrero and Arantxa Parra-Santonja.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

"We are watching a young boy turn into a man and here he is with the lead again."

Image source, Reuters

Ponder this. Kyrgios is bidding to become the first player ranked outside the top 100 to defeat the world number one since Andrei Olhovsky defeated Jim Courier at Wimbledon in 1992. Also, Nadal has not lost to a player as lowly as 144-ranked Kyrgios since losing to world number 690 Joachim Johansson in 2006. Kyrgios, as he has all day, holds with little more than the effort needed to get from his seat. A Nadal could be fatal from now on.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

"I'm not sure Nick Kyrgios can believe he could keep his nerve. It looked for all the world like Rafa would take over but he has continued to serve big. Kyrgios now looks like he could win not only this match but the whole tournament."

Nick Kyrgios what are you doing to us? On set point he absolutely mullers a forehand, finding the line and leaving Nadal floundering to net. Kyrgios stands in an arms-aloft celebration, Centre rises in acclaim. Nadal slumps in his chair, a set behind despite having not dropped his serve so far in the match. The world number one is a set away from going out.

Pressure, what pressure? I'll take a set point instead please...

Centre hushed in the evening sunshine, breaking the silence to applaud a Nadal smash that keeps us on serve. Kyrgios has his chance though, forehands deeper than the ocean provide a chance, but his ultimately too long. Pressure back on the Aussie.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

"Hand it to Kyrgios to weather the 12th game of the set and take it to another tie-break. Nadal is anxious and has overcooked a few forehands."

Image source, Reuters

Was that long from Nadal? No, on the chalk. This definitely is and Kyrgios once again has a mini-break and the balls on his racquet. Once more, though, the lead is gone with an error, leaving us level at the change.

History repeating? Nadal was a mini-break behind in the first set and goes behind again with a netted forehand. This time, though, a pass gets his back on terms, with a Kyrgios ace keeping us on serve.

It's almost as if Nick Kyrgios puts a symbol, Batman-style, into the sky to summon his serve in times of trouble. From set point down, the missiles save the Aussie and send us to a tie-break.

Is it happening again? Kyrgios surrenders the advantage with a double fault and a netted forehand. When he makes the mistake of dropping the ball into Nadal's slot, the Spaniard accepts the opportunity for set point...

Image source, Reuters

Nadal is working Kyrgios around, pausing for a chat with the umpire when a forehand almost sends the Aussie in to the front row. With a shadow cast behind him as he serves, Nadal completes his task to once again ask Kyrgios to stay in the set. This was point in set two that Kyrgios was broken to allow the match to be levelled. The next time the players sit down, one of them will be a set up.

Frank Meehan:, external Got a feeling we are watching the start of a change of guard in tennis. Next decade big match up will be Krygios versus Dimitrov.

Hmmmm, you sense a shift here. Kyrgios is shaking his head, flexing his left leg. 30-30, but a whipped forehand gives the fledging the advantage. From shade to sunlight he goes wide, deuce. For the umpteenth time, though, it's the serve to the rescue. An ace wraps it up and levels the set.

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

"All the players will start to think that this guy Kyrgios is good, so he will start to win matches on reputation alone."