Barbora Krejčíková (born 18 December 1995) is a Czech tennis player. Together with her Czech compatriot Kateřina Siniaková she won the women's doubles at the 2018 French Open and 2018 Wimbledon Championships. With her American partner Rajeev Ram she won the mixed-doubles competition at the 2019 Australian Open. Krejčíková was ranked the No. 3 junior tennis player in the world in October 2013. In 2013, she won the French Open girls' doubles, the Wimbledon girls' doubles and the US Open girls' doubles titles with fellow Czech Kateřina Siniaková. In 2013, she also won European Junior Championship U18 in Klosters, Switzerland in singles and doubles. Apart from her grand-slam victories Krejčíková has won two more doubles titles on the WTA Tour, one WTA 125K series doubles title, as well as 14 singles titles and 19 doubles titles on the ITF Women's Circuit. On 22 October 2018, she reached No. 1 in the doubles rankings, jointly with Kateřina Siniaková. Together they were fifth and sixth Czech player and 45th and 46th player ranked No. 1 since 1975. They were a 14th pair reaching No. 1 together. On 24 June 2019, she reached her best singles ranking of world No. 118, and on 22 October 2018, she reached No. 1 in the doubles ranking. She was coached by former player and 1998 Wimbledon champion Jana Novotná.