Fiedler spent his entire career at Spora Luxembourg, playing three times in the 1956–57 European Cup against Borussia Dortmund, scoring in the second leg on 6 September 1956, forcing the tie to go to a play-off, which Borussia Dortmund won 7–0.

[1] On 22 March 1953, Fiedler made his only appearance for Luxembourg U18 against Switzerland.

[2] Fiedler made 12 appearances for Luxembourg, scoring three times.

On 11 September 1957, Fiedler scored on his debut for Luxembourg in a 5–2 away defeat against the Netherlands.

This biographical article relating to Luxembourgish association football is a stub.