A point guard, Mavrenski played for Vojvodina, Profikolor, Crvena zvezda, FMP, Hemofarm, MZT Skopje, Gračanica, Gračanica, Ibon Nikšić, and ZTE KK.

[1] In July 1983, Mavrenski was a member of the Yugoslavia cadet national team that won a gold medal at the FIBA Europe Championship for Cadets in Tübingen and Ludwigsburg, West Germany.

[2] In August 1983, Mavrenski was a member of the Yugoslavia Juniors that finished 8th at the FIBA Under-19 World Championship in Palma de Mallorca, Spain.

[3] In August 1984, Mavrenski was a member of the Yugoslavia junior national team that won a bronze medal at the European Championship for Junior Men in Huskvarna and Katrineholm, Sweden.

[4] After retirement as a player, Mavrenski started coaching career.