[5][6] Mrdja scored a golden goal for Perth Glory in the final of the 2003–04 National Soccer League against Parramatta Power in the last match of the NSL.

[8] In the Mariners first competitive fixture, an F3 Derby against the Newcastle Jets in qualification for the 2005 OFC Club Championship, Mrdja broke opposing defender Andrew Durante's leg with a tackle late in extra time.

[16] The unusual nature of the move, despite being valid within the rules, created significant controversy, given its lateness in the season and the ban on direct loans between A-League clubs.

[18] Mrdja made his debut for the Victory on 5 February 2010, coming on as a halftime substitute in a win over North Queensland Fury, in the second-last round of the 2009–10 A-League regular season.

[19] He scored his first goal for the club two weeks later, in a win in the first leg of the major semifinal against Sydney FC, before being sent off later in the match for elbowing Shannon Cole.