‘A question of time’; Sinner foreshadows challenges as he seeks to keep Alcaraz at bay in Big Apple battle for No.1

The US Open begins on Sunday with Carlos Alcaraz and Jannik Sinner locked in a battle for the world’s top ranking, while player of the year honours are on the line in the women’s draw with Iga Swiatek back to her best and Aryna Sabalenka heading the seeds.