Aleksandar learned how to play chess at the age of 4 and participated in his first tournament at 7. Until the age of 14, he was quite unsure about his future in chess; however, that all changed at beginning of 2010 when he was accepted to Itaka Chess Academy and started working with GM Velimirovic. In the next 3 years, in 2013, he was able to reach Grandmaster level. Notable achievements include: winning the Serbian Youth Championship U-16, U-20; the Serbian Individual Championship in 2014, 2018; sharing 1-2 place at the Philadelphia Open in 2016; and winning the Portugal Open 2018. Aleksandar is also a regular member of the Serbian National Team since 2013, competing in two Olympiads (Norway and Azerbaijan) and two European Team Chess Championships (Poland and Greece). At the 2016 Chess Olympiad in Azerbaijan, he won the bronze medal for individual performance on board 4 with 8,5/10 points.