Kiki Bertens (Dutch pronunciation: ; born 10 December 1991) is a Dutch tennis player who turned professional in 2009. Her highest WTA singles ranking is No. 8, which she reached on 28 January 2019. Her career high in doubles is world No. 16, achieved in April 2018. To date, she has won eight singles and ten doubles titles on the WTA Tour including 2018 Western & Southern Open. Bertens is widely regarded as a clay-court specialist, but also is successful on hard courts. She is coached by Raemon Sluiter.