Daniel Siniakov
Daniel Siniakov is a Czech tennis player. Siniakov has a career high ATP singles ranking of No. 638 achieved on 2 February 2026 and a career high ATP doubles ranking of No. 333 achieved on 5 January 2026.
Siniakov has won one ATP Challenger doubles title at the 2025 INTARO Open II.
Daniel is younger brother of grandslam champion and world No. 1 player Kateřina Siniaková.
ATP Challenger Tour finals
Doubles: 1 (1 title)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | [2025 INTARO Open II – Doubles|] | Târgu Mureș, Romania | Challenger | Hard |  |