Career
He has started in local club in his hometown, and later he moved to OFK Beograd, where he passed through youth teams. After his youth career, he played for Jedinstvo Paraćin and Palilulac Beograd in the third level football leagues in Serbia. Then he moved to Kolubara Lazarevac.
Kolubara Lazarevac
Martinović played for Kolubara in first part of season 2008-2009.
He made 16 appearances, and scored 1 goal. Napredak Kruševac
In 2009, he played for Napredak Kruševac in Jelen SuperLiga, but second part on season 2008-2009 he was on loan from Kolubara.
Foreign Napredak, he played 29 times and scored two goals. Borac Čačak
= 2009-2010 In second half of season 2009-2010 he played for 10 times.
= 2010-2011 In season 2010-2011, he played 5 matches, and then, he injured his ligaments and missed the rest of season.
= 2011-2012 In season 2011-2012, he played just 8 times. Borac was relegated to Serbian First League. = 2012-2013 In 2012-2013, Martinović was one of the best and most important players for Borac Čačak.
Ater the end of season, he was on trial at Partizan, but not signed.
= 2013-2014 Foreign first half of season, he made 11 appearances. Then, he left the club
Jagodina
In a winter break off-season 2013-2014, he signed with Jagodina.
