Putaway Percentage (PutAway%) is the rate of two-strike pitches that result in a strikeout.
When examined on a pitch-type basis, this can help discern what offering a pitcher uses to finish off hitters, and his effectiveness in doing so. This puts a number to the common baseball phrase of "putaway pitch," providing a more statistically based assessment of the concept.
Highest PutAway% on sliders, 2018
Min. 100 two-strike sliders thrown (154 pitchers)
1. Ryan Pressly, 38.8%
2. Edwin Diaz, 37.3%
3. Jose Leclerc, 35.9%
4. Tanner Scott, 35.3%
5. Will Smith, 34.4%
Watch: Josh Hader strikes out Elias Diaz swinging with a fastball. Hader led MLB in Putaway Percentage on fastballs in 2018 (min. 100 two-strike fastballs thrown).