River v Boca - inside the world's fiercest rivalry

River's Franco Mastantuono and Boca's Edinson Cavani will likely play key roles on Sunday [Getty Images]When it comes to football derbies, very little comes close to matching the passion, intensity and cultural significance of Argentina's Superclasico between River Plate and Boca Juniors.Superstar players, fanatical fans, regular helpings of drama and the sinister side of the game - the Superclasico has it all.On Sunday, River's 85,000-capacity Mas Monumental stadium will host the 264th Supercla