Tadas Sedekerskis (born January 17, 1998) is a Lithuanian professional basketball player and the team captain for Saski Baskonia of the Spanish Liga ACB and the EuroLeague.

During his early career aged 14, Sedekerskis played for Kuršiai Neringa in the third-tier Lithuanian basketball league – RKL, averaging 10.6 points, 3.8 rebounds and 1.8 assists per 27 minutes over 5 games in the 2012–13 season.

[2][3] On May 10, 2014 Sedekerskis led Baskonia's junior team to a bronze medal after scoring 34 points (2-pointers: 7/10, 3-pointers: 4/11, FT: 8/11), grabbing 10 rebounds and making two steals.

[5][6] He tallied four points and a team-high five rebounds as a member of the World Select Team at the 2017 Nike Hoop Summit.

[17] He averaged a double-double with 15.7 points and 10.2 rebounds to go along with 3.8 assists, 1.3 blocks and 1.2 steals per outing[18] en route to a silver medal at the 2016 U18 European Championships in Turkey.