![Sloane Stephens defeats out of sorts Naomi Osaka in clash of US Open Champions at WTA Finals | The Independent | The Independent Sloane Stephens defeats out of sorts Naomi Osaka in clash of US Open Champions at WTA Finals | The Independent | The Independent](https://static.independent.co.uk/s3fs-public/thumbnails/image/2018/10/22/20/1052579720-594x594.jpg)
Sloane Stephens defeats out of sorts Naomi Osaka in clash of US Open Champions at WTA Finals | The Independent | The Independent
![Kiki Bertens of the Netherlands plays a return shot while competing againstNaomi Osaka of Japan during their women's singles match at the WTA tennis finals in Singapore, Friday, Oct. 26, 2018. (AP Kiki Bertens of the Netherlands plays a return shot while competing againstNaomi Osaka of Japan during their women's singles match at the WTA tennis finals in Singapore, Friday, Oct. 26, 2018. (AP](https://c8.alamy.com/comp/2MM9F5F/kiki-bertens-of-the-netherlands-plays-a-return-shot-while-competing-againstnaomi-osaka-of-japan-during-their-womens-singles-match-at-the-wta-tennis-finals-in-singapore-friday-oct-26-2018-ap-photovincent-thian-2MM9F5F.jpg)
Kiki Bertens of the Netherlands plays a return shot while competing againstNaomi Osaka of Japan during their women's singles match at the WTA tennis finals in Singapore, Friday, Oct. 26, 2018. (AP
![Naomi Osaka of Japan, reacts as she receive medical times while competing against Kiki Bertens of the Netherlands during their women's singles match at the WTA tennis finals in Singapore, Friday, Oct. Naomi Osaka of Japan, reacts as she receive medical times while competing against Kiki Bertens of the Netherlands during their women's singles match at the WTA tennis finals in Singapore, Friday, Oct.](https://c8.alamy.com/comp/2MM9F83/naomi-osaka-of-japan-reacts-as-she-receive-medical-times-while-competing-against-kiki-bertens-of-the-netherlands-during-their-womens-singles-match-at-the-wta-tennis-finals-in-singapore-friday-oct-26-2018-ap-photovincent-thian-2MM9F83.jpg)
Naomi Osaka of Japan, reacts as she receive medical times while competing against Kiki Bertens of the Netherlands during their women's singles match at the WTA tennis finals in Singapore, Friday, Oct.
![Naomi Osaka of Japan, weeps as she walks out after retire from the match against Kiki Bertens of the Netherlands during their women's singles match at the WTA tennis finals in Singapore, Naomi Osaka of Japan, weeps as she walks out after retire from the match against Kiki Bertens of the Netherlands during their women's singles match at the WTA tennis finals in Singapore,](https://c8.alamy.com/comp/2MM9F9B/naomi-osaka-of-japan-weeps-as-she-walks-out-after-retire-from-the-match-against-kiki-bertens-of-the-netherlands-during-their-womens-singles-match-at-the-wta-tennis-finals-in-singapore-friday-oct-26-2018-ap-photovincent-thian-2MM9F9B.jpg)
Naomi Osaka of Japan, weeps as she walks out after retire from the match against Kiki Bertens of the Netherlands during their women's singles match at the WTA tennis finals in Singapore,
![WTA Finals: Kiki Bertens reaches semi-finals after injured Naomi Osaka retires, Sloane Stephens also through | The Straits Times WTA Finals: Kiki Bertens reaches semi-finals after injured Naomi Osaka retires, Sloane Stephens also through | The Straits Times](https://static1.straitstimes.com.sg/s3fs-public/styles/large30x20/public/articles/2018/10/26/as-wta-2610.jpg?VersionId=u7jHaEI6T8umoiXKgvWiRy0YMKnQQmR8)