Have Sonny Gray, Pablo López, and Brandon Pfaadt Cracked the Sweeper Code?

Pitchers mostly don’t throw sweepers to opposite-handed batters. Starters especially don’t throw sweepers to opposite-handed batters. To put a number on it, 227 starters threw 250 or more pitches to opposite-handed hitters in 2023. Only 18 of that group chose sweepers even 10% of the time. Everyone knows the math: It’s the kind of pitch that simply doesn’t work when opponents get a clean look at it.
Want further proof? When pitchers have deigned to throw this suboptimal pitch, they’ve gotten punished for it. Per Baseball Savant, starters threw 4,734 oppo sweepers and accumulated 43.6 runs of negative value relative to average for their troubles. In other words, it’s generally a poor option. It’s not quite “break glass in case of emergency,” but it’s not far off. Starters rely on changeups, splitters, vertical breaking balls, or cutters to get by; anything to avoid throwing sweepers.
Okay, now that I gave you that setup, here’s the deal: It’s not universally true. Two Cy Young contenders and a top prospect have bucked the trend, throwing sweepers with relative abandon and getting away with it. What gives? Let’s look at each in turn. Read the rest of this entry »