Martynas Sajus is a Lithuanian professional basketball player for Río Breogán of the Liga ACB.

Club Baloncesto Breogán, S.A.D., also known as Río Breogán for sponsorship reasons, is a professional basketball club based in Lugo, Spain. The team plays in the Liga ACB. The club was founded in 1966 by the Varela-Portas brothers. The team played for the first time in the Spanish top league in 1970. The name of the club is a reference to legendary Galician King Breogán. It is the most popular basketball club in Galicia, and it is also the Galician club with the most seasons and games in the top top tier of Spanish basketball - Liga ACB - and European and Copa del Rey appearances in addition to that. Because of that, Breogán fans proudly nickname their team as ''O equipo de Galicia''.