Both Rafael Nadal and Stefanos Tsitsipas have the chance to end the year as world No. 1 and knock 19-year-old Carlos Alcaraz off the top spot, but it depends entirely on their performance at the Nitto ATP Finals in Turin which runs from 13 to 20 November. Currently, Carlos Alcaraz is ranked No. 1 with 6820 points but will not be competing in the ATP Finals due to an injury he picked up at the Paris Masters earlier this month, leaving things wide open for a potential shift in the rankings.Only 1000 points behind Alcaraz is Nadal with 5820, while Tsitsipas has 5350.Nadal has ended the year as world No. 1 five tim …