What is Pitch Framing? Definition, Formula, and Example
Pitch framing is the catcher's technique of receiving borderline pitches without shifting their glove, increasing the probability of a called strike.
What is Pitch Framing?
Pitch framing is the art and science of a catcher receiving a borderline pitch in a manner that tricks or subtly persuades the home plate umpire into calling it a strike. By keeping their glove quiet, avoiding dramatic mitt movement, and catching the ball on the edges of the strike zone, a catcher can steal strikes for their pitcher. In modern baseball, pitch framing is quantified by Statcast data, measuring how many strikes a catcher converts above the league-average catcher on identical pitches. A great pitch framer can save dozens of runs over a season by expanding the zone and keeping at-bats alive.
How Pitch Framing is Measured
Statcast evaluates pitch framing using Catcher Framing Runs (also called Catcher Framing Runs Above Average). The system tracks the exact coordinates of every pitch (plate_x and plate_z) and the count in which it was thrown. It then calculates the league-average probability of a pitch in that specific location being called a strike. If a catcher receives a pitch with a 40% called-strike probability and the umpire calls it a strike, the catcher is credited with +0.6 strikes (1.0 minus 0.4). These strikes are then converted into Run Value using Run Expectancy tables based on the count. Summing these run values across a season yields a catcher's total Framing Runs. A positive number means the catcher saved runs; a negative number means they lost strikes.
Worked Example
Patrick Bailey of the San Francisco Giants was one of the premier pitch framers in 2023. On pitches thrown on the lower edge of the strike zone, Bailey consistently received the ball with a quiet, downward-stabbing motion that kept the glove inside the zone. According to Statcast, Bailey generated 14 Catcher Framing Runs over the 2023 season. This means he successfully converted borderline pitches into called strikes at a rate that saved the Giants 14 runs compared to a league-average catcher. In high-leverage situations, his ability to steal a strike on a 1-2 count instead of a 2-1 count altered the run expectancy of the inning significantly.
Why It Matters
Pitch framing is a critical component of run prevention. A catcher who grades well in framing runs can effectively lower a pitcher's ERA without throwing a single pitch. For front offices, framing data is a major factor in free agent catcher valuation; a catcher with a weak bat but elite framing skills (like Austin Hedges) can still secure major league contracts. For DFS and fantasy players, knowing the umpire assignments and the framing abilities of the starting catcher provides a distinct edge when projecting strikeout totals for starting pitchers. Elite framing directly leads to more strikeouts and shorter at-bats.
Limitations and Common Misconceptions
Pitch framing data is highly dependent on the umpire. The metric assumes umpires are a constant, but in reality, umpires have wildly different strike zones. A catcher might frame a pitch perfectly, but if the umpire has a tight zone, the run value is not credited accurately. Furthermore, framing is often confused with Catcher Framing and blocking, but the metric strictly measures the conversion of borderline pitches into called strikes. It does not account for a catcher's ability to block balls in the dirt, throw out base stealers, or call a good game. As the ABS Challenge System becomes more prevalent, pitch framing value is expected to decline sharply.
Related Terms
In Legends Deck
In Legends Deck, a catcher's pitch framing rating directly impacts the simulation's strike-zone logic. When a pitch is thrown on the borderline, a high-rated framing catcher increases the probability of a called strike, boosting the pitcher's CSW Rate and lowering the opponent's On-Base Percentage. Catchers with exceptional framing metrics receive a distinct boost in defensive run prevention algorithms, making them highly valuable assets for low-power, strikeout-heavy pitching staffs.