Overview
The opener is a pitching strategy that splits the traditional starter's role. A reliever-type pitcher handles the first one or two innings before a bulk pitcher takes over for four to five innings. The Tampa Bay Rays popularized this approach in 2018, and it spread across MLB. The rationale is deploying a high-velocity reliever against the opponent's strongest hitters in the first inning, when starting pitchers statistically allow their highest batting average against. NPB clubs began experimenting with openers around 2019, primarily as an alternative to bullpen days. Challenges include increased overall bullpen workload, difficulty for bulk pitchers adjusting to mid-game entry, and psychological resistance from fans and players accustomed to traditional starters. As pitch count limits and six-day rotations continue shaping pitching management, the opener may become an established tactical option in NPB.