Medvedev gets an opportunity to pass Nadal as the Spaniard doffs a loose smash over the net, but instead he blazes the ball into the net.

Gorgeous from Nadal, angling down the line, and Medvedev can't control his response.

Ace out wide for Medvedev gets his nose that bit further in front, before he leaps and flys into a backhand that a rushed Nadal nets.

Image source, Getty Images

Great serve from Nadal, one that Medvedev can do nothing with, before an outstanding, lengthy rally is ended with a brutal forehand from Medvedev.

Nadal drifts a slice just out of bounds, and Medvedev is under way.

Andrew Castle
BBC Sport tennis commentator at the O2 Arena

I would expect Medvedev to continue to serve well, it's a significant advantage in a tie-break.

Tie-break town, here we come.

Daniil Medvedev will serve first.

Big serve down the T from Nadal, so big that the racquet bursts out of Medvedev's hands.

40-15.

Medvedev somehow manages to return a serve despite his legs going akimbo and his racquet almost jamming behind his ear as he tries to go through with a smash motion.

It's 30-15 to Nadal, though, as he nails another serve and volley.

Emphatic.

Daniil Medvedev holds to 15 and Rafael Nadal, about three minutes after serving for the match, will serve to take us into a tie-break.

My word!

Great return from Medvedev, Nadal shanks the ball into the air, and we're back on serve.

Trouble...

A spinny backhand from Nadal drifts just long, and he's got three break points to save.

Ooh. A return from Medvedev surprises Nadal, who thought it was going long, and he overbalances to put a forehand into the net.

0-30.

Nadal might be serving for a place in the final, but Medvedev takes the first point with a whistling forehand winner.

0-15.

Andrew Castle
BBC Sport tennis commentator at the O2 Arena

How alive to the opportunity was Nadal here? I'm talking about the shot Medvedev should have finished the point with - Nadal did not take his eye off the ball, he is so competitive and in the moment. Big mental error from Medvedev, very smart from Nadal.

That seemed to come out of nowhere.

Facing going 5-1 down, Nadal has won four games in a row and will now serve for the match. What grit.

What a lob!

Nadal somehow volleys the ball right onto the baseline and the Spaniard, who was a point away from being 5-1 down, will serve for the match.

Medvedev has to wait to serve as Nadal holds him up and promptly cracks down an ace to take him to 30-15.

This is going south, quickly, for Medvedev, as back to back errors hand Nadal another break point.

Russell Fuller
BBC tennis correspondent on BBC Radio 5 Live Sports Extra

It's a real test now for Daniil Medvedev now. Medvedev had not dropped a set before tonight - Nadal has not made Medvedev look so unbeatable.

It's all Nadal now.

He blitzes through his service game to hold to 15.

Nadal threads the needle and passes Medvedev with a superb backhand!

Back on serve we go.