It is the ATP Dubai Duty Free Tennis Championships on Saturday night.
Here is a rundown of everything you need to know about the tournament decider.
The finalists
It is No 2 seed Roger Federer against No 5 seed Stefanos Tsitsipas.
When the action is happening
The match is due to start at 7pm and will be on Centre Court at the Dubai Duty Free Tennis Stadium. Tickets are sold out for the event.
Roger Federer's route to the final
1st round v Philipp Kohlschreiber 6-4, 3-6, 6-1
2nd round v Fernando Verdasco 6-3, 3-6, 6-3
Quarter-finals v Marton Fucsovics 7-6, 6-4
Semi-finals v (6) Borna Coric 6-2, 6-2
Stefanos Tsitsipas' route to the final
1st round v Matthew Ebden 6-4, 3-6, 6-3
2nd round v Egor Gerasimov 6-3, 6-1
Quarter-finals v Hubert Hurkacz 7-6, 6-7, 6-1
Semi-finals v Gael Monfils 4-6, 7-6, 7-6
What is at stake
If Federer wins not only does he claim an eighth Dubai crown, it will also be his 100th career ATP Tour singles title, making him only the second man, after Jimmy Connors, to reach three figures for tournament victories in the open era of the sport, which dates back to 1968.
Tsitsipas has already achieved one major goal this week. The world No 11 will move into the top 10 for the first time in his career on Monday when the new ATP rankings are published. His semi-final win over Gael Monfils assured him of that.
Victory in Dubai would give him his third career title. It would also be two in less then a week, having won the Marseille Open last Sunday.
Past meetings
The pair have only met once previously, in the fourth round at the Australian Open in January.
Famously Tsitsipas came from a set down to beat Federer, the defending champion at the event, 6-7, 7-6, 7-5, 7-6.
What they said
Federer: "Obviously I was horribly disappointed (by the Australian Open loss) and upset that I missed as many breakpoints as I did, had all the opportunities I had. That match kind of hurt in some ways. But, you know, it's part of the game. He did very well to get out of those tricky situations.
"Again, he did the same again tonight against Monfils. He gets it done that way. It's not the classic one dimensional way. He has many ways to do it. That makes him tough to play, tough to beat. He showed me that at the Australian Open, how hard he is."
Tsitsipas: "I'm sure he will be pumped up. It's not easy. It's not easy for both of us. He obviously wants to beat me. For him, that loss was a big thing. I'm pretty sure he will come - if he wins, whoever wins - inside the court fired up, wanting to take a revenge from me. I'm definitely expecting that."
