The Royals Rotation Looks As Strong As Ever

The Royals had one of baseball’s best rotations in 2024. Kansas City starters posted a 3.55 earned run average that trailed only the 3.38 mark of Seattle’s star-studded staff. They logged 911 innings, again second-best in MLB behind the Mariners. Seth Lugo and Cole Ragans placed among the top four in AL Cy Young balloting. Michael Wacha and Brady Singer weren’t at that level, but they each topped 160 innings with a mid-3.00s ERA.

Kansas City’s offense wasn’t nearly as productive. Bobby Witt Jr. and Salvador Perez (to a much lesser extent) carried an otherwise well below-average position player group. The Royals tried to balance things with one of the bigger trades of last offseason — swapping Singer to Cincinnati for Jonathan India and former well-regarded outfield prospect Joey Wiemer.

There’s risk any time a team trades a productive starting pitcher. The “no such thing as too much pitching” cliche exists for a reason. Still, the Royals felt comfortable moving on from Singer in large part because of Kris Bubic. He had undergone Tommy John surgery in April 2023. He returned in a relief role for the second half of last season. They decided early in the offseason that Bubic would return to his old rotation job.

Bubic is running with the opportunity. He has worked to a 1.98 ERA over his first seven starts. The 27-year-old southpaw is working nearly six innings per start and has only once surrendered more than three runs. He has rattled off quality starts in four of those appearances, ranking second on the team behind Lugo. Bubic is one of seven pitchers who has topped 30 innings with a sub-2.00 ERA through the season’s first six weeks. He has punched out an above-average 23.7% of opponents against a solid 7.7% walk rate.

While the strikeout rate is more good than exceptional, there’s probably some untapped upside in that regard. Bubic fanned 32.2% of opposing hitters en route to a 2.67 ERA in 30 1/3 innings last year. It wouldn’t be fair to expect him to fully repeat that as a starter — it’s easier to miss bats when you only face a hitter one time and can throw harder in short stints — but his per-pitch metrics are more impressive than this year’s strikeout rate would suggest. His 13.2% swinging strike rate ranks 20th in MLB (among 124 pitchers with 30+ innings). He’s 16th in whiff rate on pitches within the strike zone. While he’s never going to rival Ragans in terms of overpowering hitters, Bubic’s stuff…