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Preamble

The occupational hazards of tournament pool play typically lead to at this point of the ATP World Tour Finals viewers are commonly scratching our heads, searching around for a mathematical tool and trying to work out the brain-busting permutations of qualification. However tonight’s match between Zverev and Felix Auger-Aliassime, thankfully, is simple. This is a winner-takes-all affair: the victor secures a semi-final battle against Alcaraz at this year-end tournament; the unsuccessful competitor goes home.

Zverev is the favourite for this: the world No 3 is the more accomplished player, has been the champion at this competition on two prior occasions and is ahead in their direct encounters with six victories against three defeats, having won both the games they've played on an indoor hard court.

Yet … this type of playing field on which the Canadian has won the majority of his titles, he is full of confidence after his compelling comeback against Shelton on recently and he eliminated the German in the US Open initial phase in August. Additionally, conditions are faster in Turin than at the US Open venue, which is even more beneficial in the Canadian's benefit.

Should Zverev be cautious, like he was against Sinner, and the Canadian presses the German with his stinging serves and fearless play, it could well be the North American athlete – the former prodigy who was previously positioned before the younger champions to take over from the legendary trio – who earns the uncertain distinction of playing against the global leader the next day.

Action commences: at about 8.30pm local time, 7:30 PM in the UK.