By Ros Satar, in Singapore Kiki Bertens [8] def. Angelique Kerber [1] 1-6 6-3 6-4 Bertens will now face Sloane Stephens, while Kerber faces Naomi Osaka next SINGAPORE – Kiki Bertens stuns top seed Angelique Kerber as the top four seeds at the WTA Finals all lose in the opening round-robin matches.   -Latest player gear | Pro:Direct Tennis Shop- Buy the latest gear from the top players from the Pro:Direct Tennis Shop and check out their 80% off sale … Continue reading WTA Finals 2018 | Kiki Bertens closes out round of the underdogs as the top four seeds struggle