JUST IN: Nadal gives retirement verdict as comeback remains uncertainWorld number one Novak Djokovic and US Open champion Daniil Medvedev have booked their spots at the season-closing tournament, while Stefanos Tsitsipas and Olympic champion Alexander Zverev joining them.
Matteo Berrettini, the world number seven and 2021 Wimbledon finalist, and Norway's Casper Ruud are set to qualify themselves, leaving two spots open after Rafael Nadal announced he would sit out to recover from injury troubles.
This leaves four men battling for the final opportunities to qualify, with Hubert Hurkacz, Jannik Sinner, Felix Auger-Aliassime and Norrie in the mix.
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