Born in the town of Jesenice in a family of athletes—skiing coach father Dušan Blažič and mother Ksenija who had formerly played volleyball—young Jaka took up basketball early.[1] His younger sister Pia would go on to become a professional volleyball player.
On 18 June 2013 Blažič signed a three-year deal with the Serbian team Crvena zvezda.[3] On 14 September 2015 he parted ways with the club.[4]
One day later, on 15 September 2015, he signed a three-year contract with the Spanish team Baskonia.[5] On 3 July 2017 Blažič parted ways with Baskonia.[6]
In the early morning hours of Saturday, 4 October 2014, Blažič caused a traffic accident while driving under the influence, slamming his Volkswagen Golf into the back of a taxi vehicle while changing lanes at the corner of Nemanjina and Resavska streets in central Belgrade. No injuries were reported as the traffic patrol administered a breathalyzer test on the twenty-four-year-old KK Crvena zvezda basketball player, determining his blood alcohol level was above the 0.5‰ legal limit in Serbia.[13] Several hours earlier, Friday evening 3 October 2014, Blažič had played in KK Crvena zvezda's opening game of the 2014–15 Adriatic League season versus Levski Sofia,[13] an 85-55 blowout win in which he contributed 8 points including a spectacular dunk.[14][15]
Later in the day, after paying the RSD16,000 (~€135) fine to the misdemeanor judge,[16] Blažič publicly apologized "to the taxi driver whose car I hit, as well as to my club and its fans"[13] while his club Crvena zvezda fined him according to its own disciplinary code of conduct by reportedly docking the amount of two monthly salaries from his pay.[16]
