Personal life

Mateusz is the younger son of Arkadiusz Terczynski (Arek), a former engineer, with a Masters in Engineering. Arek is now a PTR tennis coach who set up the Terczynski Tennis Academy in Worcester Park, Surrey. Mateusz’s older brother is a former tennis player who is graduated in Sport Management from the Metropolitan University of London. His mother, Eva, is a Manager in an insurance company.

At the age of six Mateusz started playing tennis seriously, training with his father in Wroclaw. His father had become an experienced tennis coach, having coached his older brother, Bartosz. Mateusz trained fitness with Krzysztof Platek, formerly the No1 Polish Champion 110 meters hurdles. When he was 13 Arek decided they should move to Wimbledon, London, in order to improve his training. He finished primary school and then they moved to London, where Bartosz was studying at the Metropolitan University and playing for the University tennis team. Mateusz continued his education at Cheam High School.

Jeremy Bates, the Director of the Sutton Tennis Academy, invited him to join the Sutton Tennis Academy and train there. Jeremy Bates is a former British Number One and a top 50 Association of Tennis Professionals (ATP) player. At the Sutton Tennis Academy Mateusz met then tennis coach Neil McAffer, a former New Zealand Number One tennis player, who coached him for a year.

In April 2011 Arek opened his own Tennis Academy, The Terczynski Tennis Academy (TTA), in Worcester Park, Surrey. Mateusz and his brother still play and train there.

From September 2011 Mateusz started at the Inter High School, an online education college. This meant he could continue his study while practising tennis full-time. It also enabled him to compete in Tennis Europe tournaments and ITF abroad. In 2012 Mateusz took and passed his GCSEs, and began studying A levels in Business and Economics with the Inter High School.

In September 2013 he decided, with his father, that he should turn professional and play tennis full-time.