Naomi Osaka holds her nerve to reach US Open third round
Two-time champion Naomi Osaka overcame a flurry of mistakes to fight past Katerina Siniakova of the Czech Republic, finding her mettle to reach the third round of the US Open.
The 13th-seed has spent years taming her own tendency toward self-recrimination and showed the best evidence of her new career outlook as she reclaimed her composure with a bathroom break before the third set at Arthur Ashe Stadium.
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