Daniel Siniakov (born 15 January 2003) is a Czech tennis player. Siniakov has a career high ATP singles ranking of No. 482 achieved on 8 June 2026 and a career high ATP doubles ranking of No. 293 achieved on 20 April 2026.[1]
Siniakov has won one ATP Challenger doubles title at the 2025 INTARO Open II.
Daniel is younger brother of Grand Slam champion and world No. 1 player Kateřina Siniaková.