Naomi Osaka has signed a 3-year endorsement deal with Nissan — and she’s well on her way to becoming the biggest star in tennis

Naomi Osaka has signed a three-year endorsement deal with Nissan, days after reports emerged that Adidas was set to reward her with the biggest contract it had ever given a female athlete. Osaka, 20, beat Serena Williams at the US Open final on September 8 and is becoming a household name. It has been a whirlwind week for Osaka and her sponsors, as one company has witnessed an increased share price of 10%. The effect is reminiscent of how Cristiano Ronaldo fever gripped Juventus FC when the Portuguese striker left Real Madrid CF to join the Italian club in

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