Mattsson's dedication to swimming paid off early in his career. In 2013, he became the first Finnish swimmer to win a medal in breaststroke at the long course world championships. He claimed bronze in the 200m event held in Barcelona, Spain.

Challenges and Injuries

Despite his successes, Mattsson faced several challenges. In 2013, he fractured his right thumb after a cycling accident but returned to competition by March 2014. In 2014, he began experiencing abdominal pain and digestion problems. These issues persisted until he was diagnosed with coeliac disease in 2019.

Coaching and Training

Since 2016, Mattsson has been coached by Eetu Karvonen. Under Karvonen's guidance, he continued to excel in his sport. Mattsson trains with the Porin Uimaseura club in Finland.

Retirement Plans

Initially, Mattsson planned to retire after the 2020 Olympic Games in Tokyo. However, the postponement of the Games due to the COVID-19 pandemic led him to reconsider. He consulted with his sport psychologist Aapo Kilpelainen about extending his career. The uncertainty around competitions influenced their training approach.

Role as a Sports Ambassador

In 2021, Mattsson was appointed as a sports ambassador for his hometown of Pori until the 2024 Olympic Games in Paris. He expressed his enthusiasm for helping children and young people and promoting physical activity within the city.

Personal Life

Mattsson resides in Pori with his wife Maiju and their two children, including their daughter Muume, born in 2017. He is fluent in Finnish and is known by the nickname "Porin Karhuksi" or "Pori Bear."

Matti Mattsson's journey through swimming showcases both his achievements and challenges. From early successes to overcoming health issues, he remains a prominent figure in Finnish sports. His role as a sports ambassador highlights his commitment to inspiring future generations.