ATP Finals: Rafael Nadal fightback boosts hopes as Stefanos Tsitsipas reaches semis

Stefanos Tsitsipas reached the semi-finals of the ATP finals, while Rafael Nadal produced a stunning comeback to boost his hopes of joining him.

Tsitsipas making his debut at the event, dominated defending champion Alexander Zverev in a 6-3 6-2 win.

Earlier, Nadal fought back from 5-1 down in the deciding set and saved a match point to beat fourth seed Daniil Medvedev 6-7 6-3 7-6.

The Spaniard must beat Tsitsipas on Friday to have a chance of advancing to world number one ranking.