Why is it der Bundesligist?

Bundesligist is a compound noun, and German compounds take the article of their last word: der Ligist. So it’s der Bundesligist.

Sense 1
der

Meaning

[1] Sports club in the Bundesliga

[1] Sportverein in der Bundesliga

Examples

[1] The Bundesliga club won the friendly against the district league club

[1] Der Bundesligist gewann das Freundschaftsspiel gegen den Kreisligisten.

Declension

1 Singular Plural
Nominativ der Bundesligist die Bundesligisten
Genitiv des Bundesligisten der Bundesligisten
Dativ dem Bundesligisten den Bundesligisten
Akkusativ den Bundesligisten die Bundesligisten

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary