Date of Birth: 
Place of Birth: Tallinn, Estonia
About Mattias Siimar
- Mattias Siimar (born 3 February 1998) is an Estonian tennis player. Siimar has a career high ATP singles ranking of 1157, achieved on 27 August 2018. Playing for Estonia in Davis Cup, Siimar has a win-loss record of 4–4.
- His twin brother Kristofer Siimar is also a tennis player.
Read more at Wikipedia