This is the 17599th most frequent Turkish word.
şampiyonanın
"The championship's" (possessive form).
The word 'şampiyonanın' in this sentence is used as a genitive case marker indicating possession, meaning 'of the championship'.
Şampiyonanın son maçı çok heyecanlıydı.
The last match of the championship was very exciting.
Here, 'şampiyonanın' denotes possession, specifying that the winner belongs to or is from the championship context.
Şampiyonanın kazananı büyük bir ödül alacak.
The winner of the championship will receive a big reward.
In this sentence, 'şampiyonanın' is used in the sense of genitive case referring to the organization related to the championship.