Rafael Nadal believes that Carlos Alcaraz is a ‘very special’ player with the ability to define an era but has had one crucial advantage over his rivals which could explain how the 19-year-old has achieved the No. 1 spot and bagged his first Grand Slam so quickly.Alcaraz became the world’s youngest No. 1 after he bagged his maiden Grand Slam title at the US Open back in September and has since become the talk of the tennis world and the ATP’s biggest rising star.Alcaraz has already enjoyed more success than many of his rivals, including the likes of Alexander Zverev and Stefanos Tsitsipas, and Nadal has put this down t …