Marcin Matkowski (born 15 January 1981) is a Polish professional tennis player whose speciality is in doubles. His current partner is Nenad Zimonjić; they have been playing together since 2015.Matkowski and Mariusz Fyrstenberg qualified as the eighth and final contenders in the 2006 Tennis Masters Cup. This was mainly because of their reaching the semifinals at the Australian Open. In 2011, they reached the US Open men's doubles final and the final at the year-end championships.