開かい幕まく戦せんかいまくせんMeanings1nounopening game; season openerRefers to the first match of a sports season or tournament. Common in baseball, soccer, and sumo contexts.プロ野や球きゅうの開かい幕まく戦せんは来らい週しゅうの金きん曜よう日びです。The opening game of the professional baseball season is next Friday.