A swing bout in boxing refers to a short boxing match that is put on at short notice, usually after the main event ends prematurely. It is not scheduled in advance, but takes place when a scheduled fight ends early and there is a gap to be filled. Promoters enforce swing bouts when a fight card ends prematurely or gets over before its stipulated time slot. Swing bouts are also known as "swing fights". It is important to note that a swing bout is different from a swing round, which is a round that is too close to call but is given to a fighter due to bias.