公式戦 (koushikisen) Japanese meaning: official match | KotomoraTomorrow is the first official match of the season.
I get more nervous in official matches than usual.
Usage patterns
公式戦に出場するto participate in an official match
He appeared in an official match for the first time this season.
公式戦デビューを果たすto make one's official-match debut
The young player made his official-match debut.
公式戦で〈動詞〉to do something in an official match (e.g. win, lose, score)
The team has won three straight official matches.