Centre Court tickets for the second week of Wimbledon have all sold out from the official channels.
But some people are trying to take advantage of the incredible demand by selling their golden tickets on secondary websites such as StubHub.
The cheapest price available for a Centre Court seat is £7,209 – 39x the initial price of £185.
The demand is so high because Federer and Nadal are set to clash for what could be the final time at the All England Club.
The due share 38 Grand Slam titles between them but are in the final years of their respective career.
For that price, Wimbledon fans would also get to see the other semi-final between world No 1 Novak Djokovic and Spaniard Roberto Bautista Agut.
But it is the Federer-Nadal blockbuster which returns to Wimbledon for the first time since 2008.
Federer is an eight-time British Grand Slam champion but he feels his rival has improved a lot over the years.
“I don’t think I really need to tell you what his strengths and weaknesses are,” he said.
“Improved so much over the years on this surface. He’s playing also very different than he used to.
“Haven’t played each other in a long, long time on this surface. He’s serving way different.
“I remember back in the day how he used to serve, and now how much bigger he’s serving, how much faster he finishes points.
“It’s impressive to see how sort of healthy he’s stayed. A lot of them are saying, Oh, it’s the end, by 2008.
“Similar to me in ’09. We’re still here. So it’s nice to play each other again.”
Nadal has not won a Wimbledon title since 2010 when he beat Tomas Berdych in the final.