Episode 1 - Nature v Nuture

The first episode of this four-part series explores what made Lionel Messi and Cristiano Ronaldo stand out as they began their journeys to becoming footballing icons.

Steve Crossman is joined by Guillem Balague, who is author of 'Cristiano Ronaldo: The Biography' and the biography 'Messi'.

From playing on the streets in Argentina and Portugal, to the bright lights of Barcelona and Manchester United, in this episode we discover how Messi and Ronaldo began to make their mark as a new footballing rivalry was formed which would dominate the game for the next two decades.

We hear from Messi's former academy team mate Cesc Fabregas on the development of a young superstar after making the move as a teenager from Rosario to Barcelona, while Rio Ferdinand describes his first impressions of an 18-year-old Ronaldo after he came to the world's attention at Old Trafford.