![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
![Dutch professional tennis player Kiki Bertens competes against Australian professional tennis player Ashleigh Barty during a group match of WTA Finals Stock Photo - Alamy Dutch professional tennis player Kiki Bertens competes against Australian professional tennis player Ashleigh Barty during a group match of WTA Finals Stock Photo - Alamy](https://c8.alamy.com/comp/2ABDANN/dutch-professional-tennis-player-kiki-bertens-competes-against-australian-professional-tennis-player-ashleigh-barty-during-a-group-match-of-wta-finals-2ABDANN.jpg)
Dutch professional tennis player Kiki Bertens competes against Australian professional tennis player Ashleigh Barty during a group match of WTA Finals Stock Photo - Alamy
![WTA Finals Singapore 2018: Angelique Kerber outlasts Naomi Osaka in instant classic as Sloane Stephens edges Kiki Bertens | South China Morning Post WTA Finals Singapore 2018: Angelique Kerber outlasts Naomi Osaka in instant classic as Sloane Stephens edges Kiki Bertens | South China Morning Post](https://cdn1.i-scmp.com/sites/default/files/images/methode/2018/10/25/b3bf1eca-d7f5-11e8-a41d-3d2712b32637_image_hires_094506.jpg)