'Novak Djokovic will be watching' - Daniil Medvedev fires early warning to Rafael Nadal

Daniil Medvedev returned to the Australian Open final after accusing Stefanos Tsitsipas of cheating and clashing with the umpire during his bad-tempered semi-final win. And the Russian was again booed by the home crowd for mentioning Novak Djokovic in his post-match interview.

The US Open champion is set to replace the Serb as world No.1 if he beats Rafa Nadal in Sunday's final.

And the Russian got to his second consecutive Grand Slam final by beating world No.4 Tsitipas 7-6 4-6 6-4 6-! in an extraordinary encounter.

No.2 seed Medvedev claimed the Greek was receiving illegal coaching from his father Apostolos - and aggressively demanded action from Spanish umpire Jaume Campistol.

Campistol gave Medvedev a warning for a visible obscenity when he hit his racquet inside his left elbow in a gesture to the crowd after they cheered a double fault to see his service broken in the second set.

Medvedev ranted at the umpire: "Are you mad? Are you mad? For what?

And his father can dock every point. Are you stupid?

"His father can talk every point. His father can talk every point. His father can talk answer point.

"Answer my question. Will you answer my question? Can you answer my question please? Can his father talk every point?

"Oh my God, oh my God, you are so bad man. How can you be so bad in the semi-final of a Grand Slam?

"Look at me, I am talking to you. Give him (a) coaching (violation) because his father is talking every point. You gave me a violation for nothing. I am talking to you."

At the end of the second set, as he left the court, Medvedev told Campistol: "Do you understand Greek? He is speaking after every point. If not, you are a small cat."

At 1-1 in the fourth set, Tsitsipas was given a warning for coaching after