Katerina Siniakova is a Czech tennis player. She was born to a Czech mother and Russian father Dmitriy, a former boxer and her coach. She began playing on the ITF Women's Circuit in the Czech Republic in June 2012. There in a doubles competition, she won her first ITF title.
She has won two singles titles and eight doubles titles on the WTA Tour, including the Grand Slam titles with Barbora Krejcíková at the 2018 French Open and 2018 Wimbledon Championships, as well as seven singles and four doubles titles on the ITF Women's Circuit. She achieved her career-high WTA rankings of No. 31 in singles and No. 1 in doubles in October 2018. Fed Cup winner in 2018.
Katerina Siniaková won her first WTA singles title at Shenzhen Open. In the second round, she edged world No. 4 Simona Halep in three sets (7-5 in the third) and claimed first win over a top-10 player.
In February 2017, she was nominated to the Fed Cup team for the first time by the captain Petr Pála as she was the third best ranked woman Czech tennis player (considering Petra Kvitová's injury) after Karolína Plísková and Barbora Strýcová.
She was ranked the world No. 2 junior tennis player in December 2012. With fellow Czech Barbora Krejcíková, she won the girls' doubles titles at the French Open, at Wimbledon and the US Open in 2013.