Kelvin Herrera’s New Twist
There’s something that would bother me about Kelvin Herrera. To be clear, it had nothing to do with his personality. And it had nothing to do with the fact that he was successful. Herrera should be successful. Have you watched him? The last two years, he’s run a 2.06 ERA. He’s allowed a .570 OPS, and while maybe that doesn’t mean a lot to you without context, how about this as context — Kenley Jansen has allowed a .569 OPS. David Robertson, .581. The numbers have been there for Herrera. He’s been a reliever with a triple-digit fastball and some statistics to match. Nothing about that is weird.
What would bother me was that, just from watching Herrera for a few minutes, you’d think he’d be a high-strikeout pitcher. Just from being aware of his velocity, you’d think he’d be a high-strikeout pitcher. I know we might make too much of strikeouts around here. I know I shouldn’t have been too bothered when Herrera was still finding ways to succeed. But the last two years, he’s been a flamethrower with the same strikeout rate as Chad Qualls. Compared to the league, Herrera actually ran a strikeout rate that was slightly below average for a reliever. It’s a small thing, maybe a petty thing, but it’s a thing my brain struggled to understand. Whenever I looked at Herrera’s numbers, I’d expect them to be something different.
Something like, say, what Herrera’s done in these playoffs. Since really emerging as a shutdown reliever for the Royals, Herrera’s struck out a little more than a fifth of the hitters he’s faced. Against the Astros and Blue Jays, however, he’s struck out about half of the hitters he’s faced. Herrera in this postseason: 33 batters, 16 strikeouts, .438 OPS. The heat, as you know, has been there. But it’s been accompanied by something different, something new. Kelvin Herrera tinkered with a slider, and he learned to harness it just in time.