noun
championship match; finals; title decider
Refers to the final match or tournament that determines the champion in sports or competitions.
明日はいよいよ優勝戦だ。
Tomorrow is finally the championship match.
彼は優勝戦で逆転勝利を収めた。
He came from behind to win in the finals.
Compound of 優勝 (championship, victory) and 戦 (match, battle).