It was Zverev who was allowed to accompany Stefanos Tsitsipas to today's semi-finals. It didn't help that Nadal beat Tsitispas 6-7 (4-7), 6-4.7-5 during Friday's first match.

Nadal was aware of the circumstances when he thanked the audience afterwards.

- I don't know if we'll see each other tomorrow, it depends on the supper. But I did everything I could today, Rafael Nadal said from the track. If the already beaten Medvedev had beaten Zverev, it would have been Nadal who was allowed to play semi-final against Roger Federer.

Now the semi-finals will be as follows: Stefanos Tsitsipas-Roger Federer and Dominic Thiem-Alexander Zverev.

Zverev paid tribute to the O2 Arena

Zverev now has the chance to defend the title. He paid tribute to the mighty O2 Arena in London.

- It is in this arena that I play my best tennis. This atmosphere is just here, nowhere else in the world, the German said.

At least Nadal had to lift a dent. The big ATP trophy who announced that he is finishing the year as a world leader in the rankings for the fifth time.

- I'm very happy. After all the things I went through in my career in the form of injuries, I never thought that at the age of 33, I would have this dent in my hands again, he said.