INDIA, Nov. 16 -- Rafael Nadal headed home from the ATP Finals after defending champion Alexander Zverev's win against Daniil Medvedev confirmed the Spaniard's exit from the season-ending tournamentRafael Nadal headed home from the ATP Finals after defending champion Alexander Zverev's win against Daniil Medvedev confirmed the Spaniard's exit from the season-ending tournament. The world number one recovered to beat Stefanos Tsitsipas 6-7 (4/7), 6-4, 7-5 in the early round-robin match at London's O2 Arena but knew he was dependent on the later result. Zverev's 6-4, 7-6 (7/4) win on Friday meant he qualified for the semi-finals from Group Andre Agassi alongside Tsitsipas. Tsitsipas, who topped the group, will play six-time champion Roger Fede...