Why is it der Libero?

Libero ends in -o, but that ending doesn’t settle the article: in a German dictionary, 45% of -o nouns take das, 43% take der, and 11% take die. So learn it with its article: der Libero.

Which endings you can rely on
Sense 1
der

Meaning

[1] Sport: Defensive player position in football and volleyball

[1] Sport: defensive Spielerposition beim Fußball und Volleyball

Examples

[1] When I played football, I was mostly set up as a Libero

[1] Als ich noch aktiv Fußball gespielt habe, war ich meist als Libero aufgestellt.

Declension

1 Singular Plural
Nominativ der Libero die Liberos
Genitiv des Liberos der Liberos
Dativ dem Libero den Liberos
Akkusativ den Libero die Liberos

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary