DJOKOVIC 1-0 STRUFF. And Djokovic begins his quest for an eighth Australian Open with a hold to 15.

Game, set and match! Djokovic is safely into the third round. The third set was one to forget for the defending champion but he played some excellent tennis at times here. Struff will have been happy to win a few games on the Djokovic serve but he was second best for a lot of this match.

The resurgent Struff from the third set has left the building. It's 4-1 to Djokovic in the fourth and the Serb has a double break as a safety net. It's only a matter of time now...

Djokovic is just three games away. He looks livelier that he did 20 minutes ago and Struff has his work cut out.

That will calm Struff's nerves at the start of this set, a love game sealed with an ace down the T.

Seven of the eight points at the start of the fourth have gone Djokovic's way now...

Djokovic puts that terrible end to the third set behind him in typical fashion, breaking Struff to 15 in the opening game of the fourth. What crisis?

My oh my. Struff has won his first ever set against Djokovic, breaking the Serb's serve again. It's not a game we expected to witness from the Serb, as he throws up two double faults, including two back-to-back to hand Struff the set. Into a fourth we go...

Struff holds and is one game away from taking us to a fourth set!

He does it the hard way as Djokovic gets a chance to break back, but a sublime low volley saves the break point, before a strong serve seals the hold. There were signs that Novak was stepping it up a gear, though.

Struff breaks again!

Without warning, Djokovic throws in a horrible service game. A good winner and a net cord allow Struff to go 0-30 up. An ace halves the deficit but Struff crafts two break point chances and only needs one!

We're on serve here and this is slightly more like the sort of pattern we saw in the first set. Still tough to see this being anything but a straight-sets Djokovic win.

Normal service has been resumed then. Just as it looked as though Struff could get on the front foot, Djokovic plays some sublime shots and breaks back straight away.

No, this is not a drill. Jan-Lennard Struff just broke Novak Djokovic to love and leads 2-0 in the third set. One assumes that there is a long way to go, though...

That could be a big moment for Jan-Lennard Struff, who is forced to dig very, very deep to hold serve. If he had been broken there, you really would have feared that the third set would have been a quick one.

Struff's improvement at the end of the first set seems a long time ago now. Djokovic is in absolutely supreme form now and he has raced through the second set 6-2. The second set took just 27 minutes, compared to a 50-minute slog in the first.

Struff is still fighting, and playing some fine shots to boot, but it's increasingly hard to see anyone but Djokovic winning this match. The second seed is playing very impressively, it must be said.

Has Djokovic broken Struff's resistance? The Serb has started the second set strongly and has a 2-0 lead under his belt already. Ominous signs...