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Serb says clinching year-end number one ranking has eased some of the pressure on him
Austrian says he has recovered from foot injury; will travel to London for tournament
Spanish tennis legend feels satisfied to be number one at 2019’s end
Swiss legend beats Serb star 6-4, 6-3 to avenge Wimbledon defeat
Serb needs to win two group matches, reach final to dislodge Spaniard from top
Apart from Federer, Nadal, Djokovic, Murray will also take part in tournament
Elite showdown which closes the men's tennis season has been held in London since 2009
21-year old triumphs in straight sets over Roger Federer and Novak Djokovic in semi-finals and finals
Swiss breaks giant South African's serve four times in 6-4, 6-3 victory
Serb tennis star beats German 6-4, 6-1 in quarter-final