Venus Williams will be taking on Garbine Muguruza in the Women's Final at Wimbledon, but just before the match gets underway a very special task must take place!
Tennis super-fan Rebecca will be performing the important coin toss to decide who gets to serve first.
Ayshah got to go on centre court to chat to her about the "once in a lifetime opportunity".
And, Head Referee of Wimbledon, Andrew Jarrett, tells Ayshah just how special the day is going to be.
Take a look at the video above.