Whiff% = whiffs / swings. MLB average is ~25%, 35%+ is elite, 45%+ is rarefied.
Per-pitch breakdown reveals putaway pitches — splitters and sliders above 40% are 'wipeout' offerings.
Imanaga's splitter posted a 41.9% whiff rate in 2024.
Inducing chases (out-of-zone swings) tends to lift Whiff%.