noun, used as a suffix
event with ... rounds/innings/legs
Attaches to a number to indicate the total number of rounds, innings, or legs in a competition. Common in sports and game contexts.
この試合は5回戦まで行われる。
This match will be played over five rounds.
3回戦制のトーナメントに参加した。
I participated in a three-round tournament.
noun, used as a suffix
nth-round match
Attaches to a number to specify a particular round in a knockout tournament. Often used with ordinals like 第1回戦.
第2回戦で強豪チームと当たった。
We faced a strong team in the second-round match.
彼は1回戦で敗退した。
He was eliminated in the first round.