Born in St. Marienkirchen in Austria, Thomas Gradinger started his career in the ADAC Junior Cup in 2009. Making quick improvements, he finished 2nd in the standings in 2011 after a strong season that saw him taking a first win, three podiums and a pole. From 2013 to 2016 he took on a new challenge as he moved to the highly competitive Spanish CEV Moto3 Championship. Moving then to the German Supersport 600 for 2016, the Austrian was crowned German Champion in 2017 thanks to four wins, ten podium and five pole positions.
In 2018, Gradinger moved over to the WorldSBK paddock as he contested his first WorldSSP season impressing with a strong progression that saw him finishing fourth in the final three rounds of the season. In 2019, he joined Kallio Racing and took a first pole position at MotorLand Aragon and a first podium at Assen, the first Austrian rider in the class to do this. After a year out in 2020, Gradinger hopes to impress in the WorldSSP Challenge and dethrone defending title-holder Kevin Manfredi.