Betwinners Soccer news: She became the first Japanese player to win a Grand Slam. But Naomi Osaka says winning the US Open last month was "not the happiest memory". More: https://t.co/OCPmRoh3Uu https://t.co/eJS4tdjmpb

She became the first Japanese player to win a Grand Slam. But Naomi Osaka says winning the US Open last month was "not the happiest memory". More: https://t.co/OCPmRoh3Uu https://t.co/eJS4tdjmpb