Game Changers visit a base camp to see how the ball kids are preparing for the ATP World Tour Finals.
Next week, the London O2 Arena will be welcoming the eight top tennis players in the world.
Sadly Andy Murray is having to rest his weary body but there are a group of young superstars you may not have heard of who will be showing off their ball skills.
Thousands of kids apply to be a ball kid at the famous competition every year and the Game Changers team visited the latest lucky winners to get a taste of their rigorous training.
Click on the video above to see what's involved but if you're aged 12-16 then start dreaming of being on this incredible stage.
Applications for being a Barclays Ball Kids at the 2014 finals opens soon and you can register your interest now via their website: www.barclaysballkids.com