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Nadal and Djokovic battle for No. 1 ... but will Spaniard play?

(CNN)The ATP Finals is heading into the homestretch in London. Hosting the year-end men's extravaganza since 2009, the tournament moves to Turin, Italy from 2021. It's anyone's guess as to how many of the Big Four will still be playing then. All four are very much around in 2019 -- after Andy Murray thought his career might be over. While the Scot won't be competing at the O2 Arena, Rafael Nadal, Novak Djokovic and Roger Federer will be, joined by ample youth. The ATP Finals is set to determine who'll end the year at No. 1, either the ailing Nadal or Djokovic. Nadal landed in Group Andre Agassi, alongside Stefanos Tsitsipas, Daniil Medvedev and Alexander Zverev, while Djokovic, Federer, Dominic Thiem and Matteo Berrettini feature in Group ...