The newly formed RTS consisted of five sections, namely football, cycling, tennis, ice skating, and gymnastics.

In 1924, the Radom Sports Association won promotion to Warsaw Class B, which was the second tier of the Polish football system at the time (the Ekstraklasa was not established until 1927).

The team won promotion to the Kielce League (Class A), beating Hakoah Będzin and KS Sosnowiec.

After winning the Kielce League, Radom played in the play-offs for the Ekstraklasa, where they were defeated by both Podgórze Kraków [pl] and Naprzód Lipiny.

In 1947, after winning the regional games, Radom again played in the Ekstraklasa play-offs and lost to Widzew Łódź.

Before the 1983–84 season, Radomiak was considered one of the favorites, and the team proved their class, gaining promotion on 20 June 1984 after beating Hutnik Warsaw 2–1.

[3] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.