Medvedev rages in opening ATP Finals defeat to Fritz
Daniil Medvedev lost his head on Sunday as he fell in straight sets 4-6, 3-6 to Taylor Fritz in the opening match of this year's ATP Finals. Sinner, who lost last year's final to Novak Djokovic, tops the world rankings after a stunning season in which he claimed the Australian and US Opens -- his first Grand Slam victories -- and won five more ATP titles.