The Pitch Repertoire Breakdown
The latest fantasy preview zeroes in on three right‑handed starters whose 2026 statistics have been far from the expectations set in prior seasons. While their overall ERAs and WHIPs sit at career lows, a closer look at pitch movement and swing‑and‑miss rates suggests that each may be on a different trajectory toward recovery.
Luis Castillo, despite posting a 6.57 ERA and a 1.62 WHIP that rank among the worst of his career, has shown a noticeable uptick in the effectiveness of his four‑seamer. In his most recent start against the White Sox, the pitch generated a 27 percent swinging‑strike rate, and right‑handed hitters have been posting a .399 wOBA against it this season. At the same time, his slider has been generating a 22.7 percent swinging‑strike rate, though it has also been yielding a .355 wOBA to right‑handed batters, indicating that the pitch remains a work in progress.
Jack Flaherty’s profile tells a different story. His 5.19 xFIP and sub‑5.00 xERA suggest that underlying performance metrics have been trending upward, yet his strikeout rates have been on a downward slide. The knuckle curve continues to be a reliable swing‑and‑miss weapon, posting a 15.7 percent rate, but his slider has slipped to just 11.8 percent swinging‑strike and has been exploited by right‑handed hitters, who are posting a .461 wOBA against it. Left‑handed batters, meanwhile, have been more successful against his four‑seamer, posting a .394 wOBA.
Tanner Bibee’s recent outings have offered a glimmer of optimism. After a shaky start to the season, his changeup has emerged as a standout, delivering an 18.5 percent swinging‑strike rate and a .154 wOBA when facing left‑handed hitters. The cutter, another secondary offering, has been equally potent, generating a 19.4 percent swinging‑strike rate and limiting right‑handed batters to a .435 wOBA. Even his curveball has shown promise, holding right‑handed hitters to a .134 wOBA.
The broader context of the rotation includes other arms such as Bryce Miller, Emerson Hancock, Michael Wacha, and Cristopher Sánchez, each of whom brings a distinct mix of pitches and recent performance trends that could influence fantasy decisions. While some may be better positioned to sustain current levels of production, the three focal starters present a nuanced picture: signs of improvement are evident, but they are accompanied by enough inconsistency to warrant careful evaluation.
For fantasy managers, the takeaway is clear: hold onto Castillo if you believe the recent uptick in his four‑seamer and slider will translate into lower wOBA figures against right‑handed hitters, consider cutting Flaherty given the high wOBA allowed by his slider, and monitor Bibee closely as his changeup and cutter could become reliable swing‑and‑miss weapons. The decision to sell or stay will ultimately hinge on how quickly the underlying metrics align with the more favorable pitch outcomes observed in recent starts.