Overview
Middle relievers are the pitchers who bridge the gap between the starter's departure and the closer's entrance. The term broadly encompasses setup men (who handle the 7th and 8th innings in winning situations) and other relief pitchers, and in modern baseball, bullpen depth is a decisive factor in team success. In earlier eras, complete games were the ideal and middle relievers held low status. But as pitching specialization advanced from the 2000s onward, the middle reliever's importance surged. The 'winning formula' - starter through six innings, specialist relievers for the 7th and 8th, closer for the 9th - became standard, elevating middle relievers to key roles in controlling game flow. The hold statistic (credited when a reliever maintains a lead and hands off to the next pitcher) was adopted as an official NPB record in 2005. The creation of the Best Middle Reliever Award gave relievers their own title, raising the position's prestige. However, middle relievers face high workloads: appearances of 60-70 games per season are not uncommon, and the cumulative fatigue from frequent outings elevates injury risk. Conditioning management remains a critical challenge for this demanding role.