Career
Standing at 6 ft 9.5 in (207 m), he plays the power forward position. Janković began training basketball in hometown club Ekonomac. Then he played for the younger categories of FMP Železnik and then Crvena zvezda.
After turning 18, in 2012 he refused to sign a professional contract with the club from Belgrade, so he moved to Belgium"s Spirou Charleroi.
Over the season, he averaged 5.2 points and 2.6 rebounds per game in his first international season. Before the 2013-2014 season, he moved to Verviers-Pepinster.
In the new team he had much bigger role, averaging 11.4 points and 5.7 rebounds over 34 games played. In 2014-2015 season, he appeared in just 18 games, averaging 16.1 points and 6.2 rebounds in 24.9 minutes per game.
On June 5, 2015, he returned to Spirou Charleroi, only to part ways with the team in late August.
Following the departure from Spirou Charleroi, he trained with the Serbian team Mega Leks, also playing friendly games with the team starting with September. On September 18, 2015, he signed with Mega Leks. Janković has successfully performed for the younger representative categories.
In 2013 he was part of the team that came up to silver medal at the Under-19 World Championship.
He was named in the All-Tournament ideal five, averaging 15.5 points and 9.1 rebounds per game.