Norrie can't take the set point and then leaves a volley open and Zverev takes it with another break-point chance.

What a game. Will it be the last one in the second set?

Facing two break points, a backhand from Norrie finds the line to keep the set alive, before a slow second serve from Norrie, but Zverev can't take advantage as he mistimes the return to balloon the second break point.

An ace from Norrie, who now has set point.

Two break points for Zverev after getting the edge of a long rally, 15-40.

A missed volley at the net from Norrie gives Zverev a chance at 0-30 with Norrie serving for the set.

Image source, Getty Images

Third seed Daniil Medvedev looks to have regained control of this fourth round match after letting two match points slip in the third set.

The Russian's serve is firing again, with world number 69 Nuno Borges unable to return the ball to apply any sort of pressure.

David Law
Commentator on BBC Radio 5 Sports Extra

Norrie is coming into this and starting to look like the more confident and assured player.

Zverev looks tight and unsure of himself. He is just rolling in his first serves.

Cameron Norrie was a set and a break down and in a whole heap of trouble, but he's won three games on the bounce and now has a chance to serve for the set.

But an angled drop shot gives Norrie a third break-point chance in this game.

A forehand from the baseline that went long on the first break point and a return that just missed the mark gets rid of Norrie's two break points, deuce.

Jonathan Jurejko
BBC Sport in Melbourne

This is a different Cameron Norrie now.

Since losing serve, the British number one has flicked a switch and jolted into life.

Six winners in the past three games have helped a more aggressive Norrie turn this second set around.

A double fault from Zverev gifts Norrie two break points.

Image source, Getty Images

Two quick service holds from third seed Daniil Medvedev bookend an immediate break of serve for the two-time finalist.

Portugal's Nuno Borges will have to come from behind as he did in the third set if he's to extend his career-best run at a Grand Slam.

A two-handed backhand from Zverev nets and then a brutal overhead smash at the net from Norrie leaves it at 0-30, with the Briton looking for a third game in a row.

Cameron Norrie is on a hot streak. He's gone more aggressive and is getting his rewards as he backs up the break to nudge ahead in the second set, ending the seventh game in style with an ace.

Image source, Getty Images

A great response from Cameron Norrie after losing his serve in the previous game.

With a lovely, guided backhand, which leaves Alexander Zverev just watching on, we're back on serve in the second set.

Two break points for Norrie, 15-40.

Image source, Reuters

More drop-shot delight for world number 69 Nuno Borges before an ace from Portugal's first ever player into a Grand Slam fourth-round match gives him the third set.

Third seed Daniil Medvedev seemed to lose his nerve in the crucial moments and has been made to pay by Borges on Rod Laver Arena.

But Norrie is still fighting. A 14-shot rally with great court coverage from both men ends with Norrie arrowing a rapid forehand winner. He's not had much joy in dealing with the Zverev serve but is at 0-30 and sniffing an immediate break back.

Jonathan Jurejko
BBC Sport in Melbourne

After serving so well for much of the first set, Norrie's level has dipped considerably in this set.

The Brit has landed just 56% of his first serves and Zverev, who has been returning very well off both wings, has punished him.

Image source, EPA

The Rod Laver Arena crowd are staying a little longer than they expected when third seed Daniil Medvedev had a 5-2 lead in this third set.

Portugal's Nuno Borges saves two match points on his own serve, the second with a crosscourt forehand winner. Not only does he hold his serve, Borges then incredibly breaks Medvedev in the next game.

The Russian double faults twice again and excellent work to unexpectedly keep himself in rallies gives Borges the chance to serve for the third set.