Japan, USA, Bulgaria, Poland… No matter the nation, Roger Federer is certain to have a legion of fans hailing from it.

He is the universal brand everyone wants a piece of and his tennis fans are as loyal as they come.

We spoke to some of the Swiss legends’ aficionados outside the O2 Arena in London, where Federer is gunning for a seventh ATP Finals title.

Check out the video above to meet some of his biggest supporters.