Japan's Osaka has 'no regrets' over chaotic US Open final

Japan's Naomi Osaka has refused to criticise Serena Williams after her historic US Open victory was overshadowed by the American's furious row with the chair umpire.

The 20-year-old melted hearts when she broke down sobbing after thrashing her idol 6-2, 6-4 to become Japan's first Grand Slam singles champion in New York last weekend.

Japanese tennis legend Kimiko Date told AFP it made her "heart ache" to see Osaka reduced to tears and unable to savour her moment of glory.

But after returning to Japan on Thursday, Osaka insisted there were no hard feelings towards Williams, who branded umpire Carlos Ramos a "thief" in an astonishing tantrum triggered by a code violation for coaching that culminated in a docked game.

"For me I don't feel sad because I wouldn't even know what I'm expected to feel," said Osaka, who has climbed from 19th to seventh in the new world rankings.

"I don't think I even thought about feeling sad because there's no experience for me to draw on in any other Grand ..