Wimbledon: Your good luck messages for Andy Murray
10 July 2015 Last updated at 16:15 BST
Andy Murray is playing Swiss tennis star Roger Federer in the Wimbledon men's semi-finals today.
Andy lost to the seven-time champion last time they came up against each other at Wimbledon in 2012.
However Andy feels confident about the match, and said: "I feel like I'm playing better tennis than I was then,".
If he gets through, Andy will go up against defending champion Novak Djokovic.
Hayley has been chatting to some of you guys, and a few famous Wimbledon faces to see what you think his chances are...