Aryna Sabalenka and Iga Swiatek are in a winner-takes-all race for world No1 - after battling mental demons on and off the court in 2024, their WTA Finals showdown could define a rivalry for the ages

It was all smiles between Aryna Sabalenka and Iga Swiatek in Riyadh as the world No1 and No2 popped balls back and forth over the net in a last practice before the start of the WTA Finals.