At the Hobart International, she reached the quarterfinal, losing there to Dominika Cibulková. She reached her first Premier Mandatory final by defeating Caroline Garcia but fell to Petra Kvitová in the final. Bertens failed to qualify for the WTA tournament in Copenhagen, falling to Johanna Konta. [18], At the 2014 French Open, she reached the fourth round as a qualifier in which she was defeated in three sets by Andrea Petkovic.
However, she lost to the top seed Garbiñe Muguruza. On 1 November 2019, she announced on Instagram that Raemon Sluiter would no longer be her coach, and Elise Tamaëla would be her new coach. However, she bounced back at the Madrid Open, where she cruised through her first three matches against Kateřina Siniaková, Jeļena Ostapenko, and Anastasija Sevastova. However, she did not go home empty handed. 16, achieved in April 2018. She then traveled to the United States for the Indian Wells and Miami Open, and lost to Timea Bacsinszky at Indian Wells in a hard-fought three setter, and in the second round in Miami to qualifier Risa Ozaki. She followed this up by winning her first match of the year at the Sydney International over qualifier Kristie Ahn. Bertens and Larsson won their second doubles title in a row. Bertens won her singles rubber against Estonia's Eva Paalma and with Michaëlla Krajicek double-bageled Anett Kontaveit and Tatjana Vorobjova. Bertens started the year in Auckland, where she entered the main draw as a qualifier. World rankings – Top ten tennis players as of week of 21 September 2020, 2016: Fed Cup semis, second WTA title and first Grand Slam semifinal, 2017: Two WTA titles, Tour Championships doubles final, 2018: First Premier and Premier 5 titles, top-10 debut, "Champions Corner: Bertens from the brink of retirement to World No.4 - 'I came a long way, "Bertens leed, maar schreeuwde niet om hulp", "De ups en downs van Kiki Bertens – ze had faalangst, dacht een jaar lang dat ze kanker had, maar is nu een complete tennisster", "Kiki Bertens is met een filantroop als coach buitenbeentje in Parij", "Beknelde zenuw dwingt Bertens tot opgave", "Grand Prix de SAR la Princesse Lalla Meryem – Main Singles Draw", http://www.tennisalternative.com/kiki-bertens-wins-fes-sandra-zaniewska-wins-tunis-itf-25k-2012-rn1269.html, "Svetlana Kuznetsova loses Comeback Match", "Heather Watson beaten by Kiki Bertens in round two of ASB Classic in Auckland", "No 1 Radwanska into semis after rain delay", "Open GDF Suez 2013: Razzano in the big picture! She reached the third round of both the Volvo Open and the Copa Solsanitas. Mertens is Napoli's all time top goalscorer.

However, she lost in the first round to Sorana Cîrstea but won the doubles with Johanna Larsson. [9] Late February she played the qualifications for WTA tournament of Acapulco. He was born in Anderlecht and currently resides in Ternat. In the quarterfinals, she avenged both the loss in last year’s final and the loss in Stuttgart against Kvitová, beating the Czech, losing just five games. There, she beat world No. This was followed by first-round losses in Palermo and Båstad to Alexandra Cadanțu and Polona Hercog respectively. The following week, she reached the semifinals in Sydney, losing to Ashleigh Barty in three sets. She continued to struggle during her next four tournaments, and lost in the first round of all of them including the Australian Open. 3 (then ranked 22) Nadia Petrova, coming back from a large deficit. 21 in the rankings. She was seeded first at the Hobart International.
[31], (W) Won; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (A) absent; (P) postponed; (Z#) Davis/Fed Cup Zonal Group (with number indication) or (PO) play-off; (G) gold, (F-S) silver or (SF-B) bronze Olympic medal; a (NMS) downgraded Masters Series/1000 tournament; (NH) not held. Originally scheduled for 11–17 May 2020, but due to the COVID-19 pandemic, it was initially rescheduled to 20–26 September 2020, a week before the 2020 French Open.

It is the 77th edition of the Italian Open and is classified as an ATP Tour Masters 1000 event on the 2020 ATP Tour and a Premier 5 event on the 2020 WTA Tour.[2][3]. In the quarterfinals, she lost to Julia Görges but achieved a career best at Wimbledon so far by reaching the last eight. [30] [29] At the Australian Open, she defeated Alison Riske in the first round before losing to Anastasia Pavlyuchenkova in the second. In the semifinals, she beat Sloane Stephens for the first time in her career, reaching a second consecutive Madrid final. During the grass season, Bertens impressed at Wimbledon with wins over top players like ninth seed Venus Williams and seventh seed Karolína Plíšková. Her highest WTA singles ranking is No.