Jannik Sinner got his bid for a first ATP Finals title underway with a 6-3, 6-4 win over Alex de Minaur on Sunday as former champion Daniil Medvedev lost his head during his defeat to Taylor Fritz.

U.S. Open finalist Taylor Fritz frustrated Daniil Medvedev to the point that the Russian smashed his racket and was docked a point in a 6-4, 6-3 victory for the American in the opening match of the AT ...