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Osaka beat his Czech rivals Petra Kafitova Who won the Wimbledon title twice, 7-6, 5-7, 6-4 to reach the Open of Australia.
The Japanese won her second consecutive title after her victory at the US Open in September and became the first Asian player to reach the top of the world rankings on Monday.
Osaka finished the match two hours and 27 minutes later and the 21-year-old became the youngest player to lead the world since the Danish Caroline Wozniacki What was 20 when he dominated the standings in 2010.
The fourth seed has also become the first player since Jennifer Capriati In 2001, she was crowned second major title after her first title.
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Osaka beat Czech rival Petra Kvetova twice, 7-6, 5-7, 6-4 to get to the Australian Open.
The Japanese won her second consecutive title after her victory at the US Open in September and became the first Asian player to reach the top of the world rankings on Monday.
Osaka finished the match in two hours and 27 minutes, and the 21-year-old became the youngest player to lead the world since Danish-born Caroline Wozniacki, 20, led the standings in 2010.
She is also the first player since Jennifer Capriati in 2001 to win a major title in the second major championship after her first title.