# 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 surface
* Hard (0–0)
* Clay (0–1)
* Grass (0–0)
* Carpet (0–0)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Aug 2021 | M15 Pärnu, Estonia | World Tennis Tour | Clay | Ergi Kırkın | 7–5, 3–6, 3–6 |

## Davis Cup
### Participations: (5–6)

* Group membership
* World 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 surface
* Hard (4–6)
* Clay (1–0)
* Grass (0–0)
* Carpet (0–0)
* Matches by type
* Singles (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.
| Rubber outcome | No. | Rubber | Match type (partner if any) | Opponent nation | Opponent player(s) | Score |
| 3–0; 17 July 2015; City of San Marino, San Marino; Europe Zone Group III round robin; clay surface |||||||
| Victory | 1 | III | Doubles (with Kenneth Raisma) (dead rubber) | Montenegro | Rrezart Cungu / Ivan Saveljić | 6–1, 6–2 |
| 3–0; 3 March 2016; Tere Tennis Centre, Tallinn, Europe Zone Group III round robin; hard (indoor) surface |||||||
| Victory | 2 | III | Doubles (with Jürgen Zopp) (dead rubber) | Kosovo | Granit Bajraliu / Gurash Hasani | 6–1, 6–1 |
| 3–0; 4 March 2016; Tere Tennis Centre, Tallinn, Estonia; Europe Zone Group III round robin; hard (indoor) surface |||||||
| Victory | 3 | III | Doubles (with Jürgen Zopp) (dead rubber) | Greece | Christos Antonopoulos / Vasileios Iliopoulos | 6–0, 6–1 |
| 1–4; 3-5 February 2017; Irene Country Club, Centurion, South Africa; Europe/Africa Zone Group II first round; hard surface |||||||
| Defeat | 4 | III | Doubles (with Kenneth Raisma) | South Africa | Raven Klaasen / Ruan Roelofse | 7–6$^{(7–4)}$, 3–6, 4–6, 5–7 |
| Defeat | 5 | IV | Singles (dead rubber) | South Africa | Lloyd Harris | 5–7, 3–6 |
| 3–2; 7-9 April 2017; Tere Tennis Centre, Tallinn, Estonia; Europe/Africa Zone Group II relegation play-off; hard (indoor) surface |||||||
| Victory | 6 | III | Doubles (with Kenneth Raisma) | Monaco | Romain Arneodo / Benjamin Balleret | 4–6, 6–1, 6–2, 7–6$^{(9–7)}$ |
| Defeat | 7 | IV | Singles (dead rubber) | Monaco | Lucas Catarina | 4–6, 6–4, 6–7$^{(3–7)}$ |
| 1–3; 3-4 February 2018; Šiauliai Tennis School, Šiauliai, Lithuania; Europe/Africa Zone Group II first round; hard (indoor) surface |||||||
| Defeat | 8 | III | Doubles (with Kenneth Raisma) | Lithuania | Ričardas Berankis / Laurynas Grigelis | 6–2, 4–6, 6–7$^{(4–7)}$ |
| 2–1; 6-7 March 2020; Alex Metreveli Tennis Club, Tbilisi, Georgia; World Group II playoff first round; hard surface |||||||
| Victory | 9 | III | Doubles (with Vladimir Ivanov) | Georgia | Aleksandre Metreveli / George Tsivadze | 3–6, 6–3, 6–3 |
| 0–2; 17-18 September 2021; Jan Group Arena, Biel, Switzerland; World Group II first round; hard (indoor) surface |||||||
| Defeat | 10 | II | Singles | Switzerland | Henri Laaksonen | 4–6, 0–6 |
| Defeat | 11 | III | Doubles (with Vladimir Ivanov) | Switzerland | Marc-Andrea Hüsler / Dominic Stricker | 4–6, 6–7$^{(4–7)}$ |