| WTA Sydney | 01/07 01:00 | - | Anastasija Sevastova v Kiki Bertens | Cancelled | |
| WTA Brisbane | 01/02 05:00 | 26 | [34] Donna Vekic v Kiki Bertens [9] | 7-6,1-6,7-5 | |
| WTA Brisbane | 12/31 05:15 | 25 | [12] Elise Mertens v Kiki Bertens [9] | 2-6,7-6,4-6 | |
| WTA Finals | 10/27 08:00 | 28 | [9] Kiki Bertens v Elina Svitolina [7] | 5-7,7-6,4-6 | |
| WTA Finals | 10/26 08:00 | 1 | [4] Naomi Osaka v Kiki Bertens [9] | Retired | |
| WTA Finals | 10/24 14:20 | 2 | [6] Sloane Stephens v Kiki Bertens [9] | 7-6,2-6,6-3 | |
| WTA Finals | 10/22 14:15 | 1 | [2] Angelique Kerber v Kiki Bertens [9] | 6-1,3-6,4-6 | |
| WTA Moscow | 10/17 12:20 | 26 | [10] Kiki Bertens v Aliaksandra Sasnovich [31] | 3-6,6-4,3-6 | |
| WTA Linz | 10/11 14:00 | 26 | [137] Margarita Gasparyan v Kiki Bertens [10] | 7-5,2-6,7-6 | |
| WTA Linz | 10/10 15:50 | 25 | [192] Barbara Haas v Kiki Bertens [10] | 2-6,1-6 | |
| WTA Beijing | 10/04 06:10 | 26 | [40] Katerina Siniakova v Kiki Bertens [11] | 6-4,6-3 | |
| WTA Beijing | 10/02 06:45 | 25 | [57] Kirsten Flipkens v Kiki Bertens [11] | 1-6,1-6 | |
| WTA Beijing | 09/30 14:40 | 24 | [57] Sorana Cirstea v Kiki Bertens [11] | 2-6,0-6 | |
| WTA Wuhan | 09/25 07:50 | 25 | [11] Kiki Bertens v Anastasia Pavlyuchenkova [39] | 4-6,2-6 | |
| WTA Wuhan | 09/24 11:30 | 24 | [11] Kiki Bertens v Belinda Bencic [42] | 6-3,4-6,6-2 | |
| WTA Seoul | 09/23 05:00 | 29 | [53] Ajla Tomljanovic v Kiki Bertens [12] | 6-7,6-4,2-6 | |
| WTA Seoul | 09/22 05:00 | 28 | [32] Maria Sakkari v Kiki Bertens [12] | 4-6,2-6 | |
| WTA Seoul | 09/21 06:50 | 27 | [84] Evgeniya Rodina v Kiki Bertens [12] | 6-3,3-6,0-6 | |
| WTA Seoul | 09/20 06:30 | 26 | [89] Dalila Jakupovic v Kiki Bertens [12] | 4-6,5-7 | |
| WTA Seoul | 09/19 04:40 | 25 | [90] Luksika Kumkhum v Kiki Bertens [12] | 6-7,2-6 | |
| US Open Women | 09/01 15:00 | 25 | [13] Kiki Bertens v Marketa Vondrousova [103] | 6-7,6-2,6-7 | |
| US Open Women | 08/30 18:05 | 24 | [13] Kiki Bertens v Francesca Di Lorenzo [193] | 6-2,6-1 | |
| US Open Women | 08/28 17:00 | 23 | [13] Kiki Bertens v Kristyna Pliskova [95] | 6-0,7-5 | |
| WTA New Haven | 08/21 16:00 | 25 | Kiki Bertens v Anett Kontaveit | Cancelled | |
| WTA Cincinnati | 08/19 18:00 | 29 | [1] Simona Halep v Kiki Bertens [17] | 6-2,6-7,2-6 | |
| WTA Cincinnati | 08/18 16:00 | 28 | [6] Petra Kvitova v Kiki Bertens [17] | 6-3,4-6,2-6 | |
| WTA Cincinnati | 08/17 22:10 | 27 | [7] Elina Svitolina v Kiki Bertens [17] | 4-6,3-6 | |
| WTA Cincinnati | 08/16 23:00 | 26 | [30] Anett Kontaveit v Kiki Bertens [17] | 3-6,6-2,3-6 | |
| WTA Cincinnati | 08/16 00:20 | 25 | [17] Kiki Bertens v Caroline Wozniacki [2] | Retired | |
| WTA Cincinnati | 08/14 19:30 | 24 | [17] Kiki Bertens v Coco Vandeweghe [24] | 6-2,6-0 |
Wikipedia - Kiki Bertens
Kiki Bertens (Dutch pronunciation: [ˈkiki ˈbɛrtəns]; born 10 December 1991) is a Dutch former professional tennis player. Her career-high WTA singles ranking was world No. 4, which she reached on 13 May 2019, becoming the highest-ranked Dutch female player ever. Her career-high doubles ranking of world No. 16, she achieved in April 2018. She won ten singles and ten doubles titles on the WTA Tour including 2018 Cincinnati Open and 2019 Madrid Open. Bertens was widely regarded as a clay court specialist, but also was successful on hardcourt.