When the Los Angeles Dodgers acquired Roki Sasaki last winter, expectations soared due to his reputation as a generational talent featuring triple-digit fastball velocity and a sharp splitter. However, after a year with the team, advanced statistical models highlight concerns about his true pitching effectiveness, raising questions about whether his challenges were always foreseeable. The focus keyword, Roki Sasaki pitching struggles, is central to understanding the current evaluation of his skill set.
According to the 2026 Worst Pitcher proStuff+ leaderboard from Pitch Profiler, Sasaki ranks with a 93 proStuff+, placing him sixth-worst across Major League Baseball. This stat isolates raw pitching qualities such as velocity, movement, spin efficiency, and release consistency, rather than traditional results like ERA or postseason success.
Why Sasaki’s Arsenal Has Fallen Short of Expectations
Despite fastball speeds still reaching 98 mph and occasional brilliance from his splitter, the overall shape and movement of Sasaki’s pitches have made him easier for hitters to anticipate and connect with. In the 2025 season, his 4.72 ERA reflected the difficulties he faced, with inflated pitch counts and erratic command becoming frequent issues. A shoulder impingement later in the year forced him out of action for several months, casting doubt on his ability to finish the season.
Upon his return in late September, Sasaki’s role shifted to closer, where he delivered strong postseason performances that were integral to the Dodgers’ second consecutive World Series win. Still, the adrenaline and short sample of October could mask the limitations exposed over a full rotation workload.
Spring Struggles and the Need for Pitching Variety
Opening this spring, Sasaki’s performance mirrored previous struggles. He threw 36 pitches in just over an inning and a third, with only half reaching the strike zone while allowing three runs and two walks. This unevenness aligns with his lower proStuff+ score, which indicates that his pitches’ physical quality may not provide enough buffer for command mistakes, which become far more costly at this level.
Dodgers manager Dave Roberts has openly stated that Sasaki requires a third pitch to improve his effectiveness. The team is experimenting with new offerings like a two-seamer and cutter to add horizontal movement and complicate hitters’ timing, moving beyond the fastball and splitter duo.
In today’s game, batters adjust quickly during multiple plate appearances, so unpredictability is crucial. Diversifying Sasaki’s pitch arsenal is not merely beneficial; it is essential for him to evolve into the dominant ace the Dodgers and fans hoped to see.
Potential for Improvement Through Pitch Design and Recovery
Fortunately, there is optimism about Sasaki’s future. Fully recovered from his shoulder injury, he enters the new season physically ready. Advances in pitch design and the Dodgers’ renowned ability to develop pitching talent offer promising avenues for improvement. Adjustments in seam orientation, release timing, or adding movement can rapidly enhance a pitcher’s effectiveness, turning a low proStuff+ rating into one that rivals top-tier performers.
Historically, the Dodgers have transformed many pitchers into stars, and their staff appear confident in Sasaki’s capacity to make those adjustments and fulfill his potential.
The Broader Impact of Sasaki’s Development on the Dodgers
Sasaki’s ongoing struggles and potential growth hold significant implications for the Dodgers’ pitching staff and overall championship aspirations. The team’s investment in advanced metrics like proStuff+ to evaluate and guide pitchers demonstrates a shift toward data-driven development strategies. If Sasaki adapts his repertoire and command, he could become a cornerstone of the Dodgers’ rotation for years to come. Conversely, failing to address these underlying issues might limit his impact and leave the team searching for pitching answers once again.
2026 Worst Pitcher proStuff+ Leaderboard pic.twitter.com/qZuntJoMIA
— Pitch Profiler (@pitchprofiler) February 26, 2026
