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At a family dinner to celebrate her 22nd birthday, Naomi Osaka turned to her mother to ask whether she thought her daughter would have achieved more by this point in her life.
Tamaki Osaka shook her head.
"Or do you think this is acceptable?" the birthday girl followed up.
"More than acceptable," was the reply.
When that exchange was captured by a Netflix mini-series, Osaka was already a two-time Grand Slam champion and world number one.