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Roki Sasaki Shows Measured Growth as Splitter and Communication Lift Results

Improved pitch mix and clearer dialogue with Dodgers coaches have translated to better outings and will shape whether he can develop into a frontline starter or a back-end option.

Overview

  • The Dodgers signed Sasaki in January 2025 after four years in Japan and he arrived with limited major-league experience, so the club expected a period of adjustment.
  • A right shoulder impingement early in his Dodgers tenure cost him innings, but he returned as a postseason reliever and allowed one earned run across nine outings, building trust with the staff.
  • This spring he added a splitter and, with stronger communication with coaches, produced noticeably better results in May with a 3.18 ERA over a recent stretch.
  • Sasaki’s season line still sits at 3-3 with a 4.59 ERA, and evaluators caution that his fastball remains hittable, which could cap his ceiling unless that primary pitch becomes more effective.
  • The Dodgers are managing his workload and helping his cultural transition with interpreters and player support, and the next steps will be monitoring fastball development, pitch usage and ongoing health.