Kiki Bertens is a Dutch tennis player who turned professional in 2009. Her highest WTA singles ranking is No. 4, which she reached on 13 May 2019, becoming the highest ranked Dutch female player ever. Her career high in doubles is world No. 16, achieved in April 2018. To date, she has won ten singles titles and ten doubles titles on the WTA Tour including 2018 Western & Southern Open and 2019 Mutua Madrid Open. Bertens is widely regarded as a clay-court specialist, but also is successful on hard courts. Raemon Sluiter has been her coach. 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. Tamaëla was her interim coach at the time.