For the first time in an international championship, Klaudia Adamek competed at the U18 World Championships in Cali 2015. There she was eliminated over 100 meters in the preliminary run and reached the semi-finals over 200 meters. She also won the silver medal over 100 meters in 12.16 seconds at the European Youth Olympic Festival in Tbilisi . In 2016 she won the bronze medal over 100 meters and silver with the Polish sprint relay (1000 meters) at the U18 European Championships, which were held for the first time in Tbilisi. At the U20 World Championships in Bydgoszcz , she was eliminated over 100 meters in the first round and took fourth place with the Polish 4 x 100 meter relay. In 2017 she finished sixth at the U20 European Championships in Grosseto over 100 meters and was eliminated with the Polish relay in the preliminary stages.
Personal bests
100 meters: 11.67 s (+1.4 m / s), June 2, 2017 in Bydgoszcz
60 meters (hall): 7.46 s, February 11, 2017 in Toruń
200 meters: 24.04 s (+0.4 m / s), August 6, 2016 in Wroclaw