Kiki Bertens
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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. 10, which she reached on 8 October 2018. Her career high in doubles is world No. 16, achieved in April 2018. To date, she has won seven 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.

Bertens was born on 10 December 1991 in Wateringen near the Hague, but grew up in the town of Berkel en Rodenrijs. She has two sisters, one older and one younger. Bertens started playing tennis at age six at ATV Berkenrode, a tennis club where her aunt and uncle played. She has been coached by Martin van der Brugghen at the club since she was seven years old. Van der Brugghen recognized her ability and continued to coach her primarily to help her reach her potential. He said, "In the youth we have supported her very much. I taught her for little money because I find it interesting to see how far you can get with someone." Bertens received little support from the Dutch tennis federation. She did not play on the ITF Junior Circuit except for one appearance at the Junior Fed Cup in 2007.