Roger Federer is chasing his eighth Wimbledon title
The Swiss legend is now 35 but he's still one of the best in business.
He plays his 12th Wimbledon semi-final today, against Tomas Berdych, and he remains the the bookies' favourite to win the whole thing on Sunday.
If he does, that would be the eighth time Federer has won the Wimbledon title.
Cilic booked his spot in the final after beating Andy Murray's conqueror Sam Querrey in four sets today.
Marin Cilic will face either Tomas Berdych or Roger Federer in Sunday's final
Speaking after the game, Cilic heaped praise on Federer and said: "It's definitely going to be a huge match between Roger and Tomas, who is also playing really well.
"It's an open match but Roger is playing the best tennis of his career on this court.
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"Whoever it's going to be, I'm going to be ready. I'll focus on my tennis and play my own game."
The omens aren't good for Cilic if it is Federer who he meets on Sunday.
The pair have met seven times before with Cilic enjoying a 6-1 record over the Croat.