Sergio Romo on His Bowling-Ball… Slider
Late in the 2017 season, I approached Sergio Romo to ask about backup sliders. More specifically, I wanted to know if he’s ever thrown one intentionally. A handful of pitchers to whom I’ve spoken have experimented with doing so. It can be an effective pitch when well located; hitters recognize and react to a slider, only to have it break differently than a slider. As a result, they either jam themselves or are frozen.
Romo, of course, has one of the best sliders in the game. The 34-year-old right-hander has lived and died with the pitch for 10 big-league seasons, throwing his signature offering 52.4% of the time. Among relievers with at least 250 innings, only Carlos Marmol (55.5%) and Luke Gregerson (52.7%) have thrown a slider more frequently over that span.
What I anticipated being a short conversation on a narrow subject turned into wider-ranging, and often entertaining, meditation on his slider (with a look at Zach Britton’s sinker thrown in for good measure). It turns out that Romo’s backups are all accidental — the exact mechanics behind them remain a mystery to him — but he does know how to manipulate the ones that break. He’s also knowledgeable about his spin rate, thanks to his “player-profile thingy.”