They were 'undefeated' in their first nine games. [=they won their first nine games]
an 'undefeated' team/season
(..) with an historical final match. Returning to the Colosseum today... after five years in retirement, Caesar... is pleased to bring you the only... undefeated champion... - Yah! Yah! -in Roman history, the legendary Tigris of Gaul! Whoa! Whoa! He knows too well how to manipulate the mob. (..)2000 Gladiator