Viddal Riley (left) poses with KSIImage source, Getty Images
Image caption,

Viddal Riley (left) - who previously trained YouTuber KSI - has won all 14 of his pro fights with seven knockouts

ByKal SajadBBC Sport boxing journalist

Viddal Riley had spent years learning how to fight. Then he taught a YouTuber, and that became the story.

On Saturday, the Londoner defends his European cruiserweight title against unbeaten Frenchman Seydi Coupe at Wembley Arena, with a world-title shot within reach.

Yet it was his work with social media star KSI that first brought him mainstream attention, training the YouTuber for his fights against Joe Weller and Logan Paul.