Craig Kimbrel's Royals Surge Just Created A Bigger Bullpen Question

Craig Kimbrel's impressive start with the Kansas City Royals is proving to be a savvy midseason acquisition, but can he maintain this form and lead the bullpen long-term?

Craig Kimbrel’s arrival in Kansas City looked like a move built more on reputation than current form. The Royals signed a future Hall of Fame closer who had already been cut loose by both the Mets and Rays this season, and plenty of fans had every reason to wonder what exactly they were getting.

So far, though, Kimbrel has answered with results that don’t fit the usual late-career script. In five appearances covering 5.1 innings, he has yet to allow a run. His line with the Royals sits at a 0.00 ERA, a 0.56 WHIP and a .071 BAA.

He also picked up save No. 441 in Saturday’s 3-1 win over the Tigers, pulling him within 37 of Lee Smith for fourth place all-time. That kind of production is more than enough to qualify as a pleasant surprise, especially for a Royals team that has been putrid in closing out games in the ninth in 2026. And with Kansas City riding an eight-game winning streak, Kimbrel’s role has been part of a bullpen turnaround that has helped make that run possible.

Still, the numbers underneath the shiny surface tell a different story. Kimbrel is 38 years old, in his 17th major league season, and the decline has been building for years, especially since leaving Boston after the 2018 season and even earlier after departing Atlanta in 2014.

He was decent with the Rays, posting a sub-4.00 ERA in 18.2 innings, and he has looked excellent in Kansas City early on. But the warning signs are real.

His strikeout rate has fallen to 8.08 K/9 across all three stops this season, and it’s just 5.06 K/9 with the Royals. That is a long way from the 16.00-plus K/9 monster he was in his prime with the Braves and Red Sox.

The advanced numbers point in the same direction. Kimbrel’s 3.09 FIP with Kansas City and 4.16 combined FIP in 2026, along with a 4.23 xERA and .240 xBA, suggest this run is probably not built to last. His 11.3% walk rate on the year is also below average, which only adds to the concern about his command.

That’s why, as strong a feel-good story as this has become for the Royals, Kimbrel still looks more like a short-term boost than a long-term answer. Even with Kansas City’s bullpen in rough shape, owner John Sherman said in an interview a few weeks ago that young players would be a focal point for building the relief corps this offseason.

That might be the right call, and Kimbrel’s early success doesn’t really change it. He’s been a welcome jolt, but he isn’t a piece to build around.

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