Piers Newbery
BBC Sport at Melbourne Park

"A bizarre moment at the end of the third set as Djokovic appeared not to realise he'd won the set, and had to have it pointed out to him by the umpire before walking back to his chair grinning and shaking his head."

Leon Smith
GB Davis Cup captain

"Novak Djokovic does not look himself and does not look to have the same focus as he would do normally."

So, we're into a fourth set and there hasn't been much razzle-dazzle or thigh slapping in this match. It's been a tale of uncharacteristic errors rather than brilliant winners, with Wawrinka making 45 unforced errors in total. A confident hold of serve from Djokovic as we patiently wait for some fireworks to explode.

Image source, AFP

The crowd are whipped into a frenzy as Wawrinka produces a magical shot, stooping to scoop a forehand volley over the net to leave Djokovic looking like a muggle. Even Djokovic raises is racquet and taps his strings in admiration of his opponent's wizardry. Wawrinka strolling at 40-15, but he blunders with a double fault. A minor fault or a moment to regret? It could be the latter as the Swiss botches a forehand. Deuce. Djokovic upping the ante... collecting a break point and Wawrinka bows out with a netted forehand. In one game the Swiss goes from wizard to mere mortal.

Sloppy errors blighting both players. Wawrinka hooks a backhand over the baseline and Djokovic, at 40-15, has the space to breathe a little easier. Djokovic fans sigh in relief as Wawrinka's radar malfunctions again. The Serb holds to 15 and Wawrinka must serve to stay in the set.

Piers Newbery
BBC Sport at Melbourne Park

"British junior Katie Swan has just faced the busiest press conference of her young career after a lengthy bout of treatment. The 15-year-old overcame cramp and saved three match points to win a dramatic girls' semi-final. 'I never give up and keep fighting until the end, because it's never over until it's over, which I proved today. I just hope people think of me as someone who's really, really tough to beat.'"

Britain's Jordanne Whiley and her Japanese partner Yui Kamiji have won their fifth consecutive Grand Slam wheelchair doubles title.

Image source, AFP

They saved a matchpoint to beat the Dutch pair of Jiske Griffioen and Aniek Van Koot 4-6 6-4 7-5 in three sets in an Australian Open final which lasted three hours and 21 minutes.

Thud. Thud. Thud. Wawrinka giving Djokovic little chance with a hat-trick of bodacious first serves. Another first serve down the 'T'... Djokovic dives to his right, gets some graphite on it but the ball spins wildly out of control and Wawrinka levels.

Tony Stewart:, external Djokovic has this inner spirit inside him that tells him to fight on even when he's weak. It's beautiful, but also scary.

Luc Turnbull:, external Stan has this match, Djokovic is looking nervous.

Robin Armstrong:, external Some serious "mockers", on the text updates. Each time "Novak is cruising" bang goes the service game.

Neil McDonald:, external This is tough to call, Stan seems to be at home at the Australian Open and can find a big match game here.

Leon Smith
GB Davis Cup captain

"Novak Djokovic is not winning enough points on the second serve of Stan Wawrinka and we would normally say that his return of serve is Djokovic's biggest strength."

As we have seen in the past, Djokovic has infinite reserves of willpower and he will need to dig deep to come through his scrappy form. A hold to love is the nerve-easer that the doctor would have ordered.

Image source, Getty Images

At one side of the net is the best player in the world, one of the sport's greats, a four-time champion of this tournament. At the other side is a defending champion who has oodles of power and even more belief since he won this tournament 12 months ago. Their form has been patchy in this match, but someone's got to win.

Djokovic hitting with greater freedom in this game which is why we're level at 30-30. Wawrinka, though, turns himself into an intimidating beast at the net which perhaps explains why the top seed plonks a backhand into the tape. The net has turned into an impenetrable barrier for Djokovic and we're back on serve.

Leon Smith
GB Davis Cup captain

"Stan Wawrinka will feel he can get back into the match. It's amazing how one player finds form and the other one goes completely off his game. Novak Djokovic is making it more difficult than it needs to be and he has had opportunities to move away in this set.

"The match is topsy-turvy and we haven't had both players playing well at the same time. We always want these incredible matches but we can't always have it like that."

Image source, Reuters

Wawrinka mixing it up, dancing towards the tape and seeing off his rival with a cushioned volley. A clench of the fist from the Swiss, deafening roars from the crowd as he gathers a 0-30 lead. Three break points soon come Wawrinka's way and Djokovic sinks like a soufflé - screwing a backhand volley into the tramlines. A strange game from Djokovic.

Niall Murray:, external You always feel Novak has another gear to go up whenever he sees fit.

Two drop shots from Djokovic, and the collective groans which ripple around the arena tells you what the spectator think of those shots. Two easy points for Wawrinka, but Djokovic hauls himself back into contention at 30-30 thanks to needless errors from Wawrinka. And another mistake - a limp backhand into the tramlines - gives Djokovic a break point. Wawrinka holds firm in a crisis, though.

Leon Smith
GB Davis Cup captain

"Stan Wawrinka was looking good after the end of the second set and got himself into a great position in the opening game of the third set.

"He had a break-point opportunity, but with an open court he missed and since that moment he has lost some inner belief. Novak Djokovic has definitely raised his game by doing what he does best, being so resilient. All of a sudden Djokovic looks in control."

Djokovic has flicked a switch and his engine is now firing. A fist-pump from Boris Becker on the sidelines as his charge comes out on top of a baseline brawl. Steely defence from Djokovic forcing Wawrinka to club a forehand long for 40-15. The Serb isn't home and dry yet, though, with Wawrinka nibbling at his lead at 40-30, but the defending champion fires into the tramlines again and if Wawrinka is to win this contest he will probably have to go the distance.

The Djokovic backhand is not singing from the same hymn sheet as the other parts of the Serb's game. But the Djokovic forehand is hitting the high notes, a dreamy winner gives the top seed a chance at 30-15 and the pressure tells as Wawrinka falters. Two break points Djokovic. The pair trade missiles from the baseline... Wawrinka, on the front foot, seems in control, but his forehand drifts over the baseline. The Swiss punished for his impatience.

Image source, Reuters