Mattias Siimar

Mattias Siimar (born 3 February 1998) is an Estonian tennis player.

Siimar has a career high ATP singles ranking of 1036, achieved on 25 October 2021.

Playing for Estonia in Davis Cup, Siimar has a win–loss record of 5–6. His twin brother Kristofer Siimar is also a tennis player.

ITF World Tennis Tour and Challenger finals

Singles: 1 (0–1) Legend (singles)ATP Challenger Tour (0–0)ITF World Tennis Tour (0–1)Titles by surfaceHard (0–0)Clay (0–1)Grass (0–0)Carpet (0–0)

Davis Cup Participations: (5–6) Group membershipWorld Group (0–0)WG play-off (0–0)Group I (0–0)Group II (2–6)Group III (3–0)Group IV (0–0)Matches by surfaceHard (4–6)Clay (1–0)Grass (0–0)Carpet (0–0)Matches by typeSingles (0–3)Doubles (5–3) indicates the outcome of the Davis Cup match followed by the score, date, place of event, the zonal classification and its phase, and the court surface.