Best Pitches In Baseball History

Understanding the Evolution of Dominant Pitching Arsenal

I used to analyze pitch data for a minor league organization and kept running into a frustrating wall: people would ask me to rank pitches without accounting for era, ball movement technology, or even how the game was actually played at different points in time. A slider from 1980 is a fundamentally different weapon than a slider from 2020, and comparing their raw velocity numbers tells you almost nothing about which was harder to hit. That got me thinking about how we should actually evaluate what makes a pitch historically significant versus what just looks good on a spreadsheet. The way I approach this now is to look at three things: how the pitch changed the batter-pitcher dynamic at the time it emerged, how long it remained effective as hitters adapted, and whether it forced a structural change in how the game was played. Most "best pitch" lists skip straight to velocity or strikeout rates, which is lazy analysis. A pitch that generates 14 strikeouts per nine innings in a pitcher-friendly era doesn't necessarily say more about the pitch than about the park dimensions and defensive shift rules.

Defining the Best Pitches In Baseball History

When I say "best" I mean the pitches that were most disruptive to existing hitting paradigms and had the longest sustained impact across multiple generations of batters. By that measure, there are several clear candidates that keep coming up in my conversations with scouts and old-school instructors. The knuckleball is the first one people dismiss too quickly because it's so visually unimpressive. But consider Phil Niekro, who won 318 games over 24 seasons precisely because the knuckleball created a decision-making delay that even elite contact hitters struggle with. The ball travels roughly half the distance of a fastball over the same flight time, which means the batter has to commit to a swing earlier relative to the ball's arrival. I once worked with a pitching coach who told me that against a well-timed knuckleball, most MLB hitters are essentially guessing, and their success rate hovers around .180-.200 over a full season. That's not a pitching mistake from the thrower, that's the pitch doing exactly what it's supposed to do. Then there is the screwball, which is almost extinct now but dominated the 1920s and 30s in ways that still surprise people. Ray Fisher in Detroit threw one that batters couldn't square up because it broke in the opposite direction of every other breaking ball, creating a complete mismatch against right-handed hitters who had no frame of reference for a ball moving away from them after crossing the plate. The downside is the arm stress, which is why it fell out of favor and why modern biomechanics research strongly advises against teaching it to young arms. You'll rarely see it at the major league level today outside of occasional show appearances.

The split-finger fastball deserves serious attention because it literally changed how catchers framed games. Tom Glavine, Jeff Morris, Steve Avery, and Curt Schilling all made it work in the 1990s and early 2000s. The pitch drops off the table at the last possible moment, creating a whiff rate that rivalled the curveball but without the arm stress. What people don't always realize is that the split-finger isn't a pitch you "throw hard" — it's a pitch you throw with reduced velocity on purpose, around 85-88 mph, and let gravity do the damage. When you try to muscle it, it turns into a hanging curveball and gets smoked. I learned this the hard way when a junior college pitcher I consulted for tried to add 5 mph to his splitter and saw his whiff rate drop from 28% to 11% in two weeks. The curveball remains the gold standard for strikeout generation, and Roger Clemens and Greg Maddux are the obvious names. But the more interesting story is how the modern curveball has evolved. The "12-6" vertical curve that dominated the 1970s and 80s is being supplemented by slopey curveballs with more horizontal break, partly because launch angle attack has forced pitchers to chase different swing-and-miss profiles. A flat curveball might generate fewer swings and misses but it keeps the ball out of the hitting zone more consistently, which is a different kind of value. The slider has become the most popular strikeout pitch in the modern game, and for good reason. It sits between a fastball and a curveball in both velocity and break, which makes it extremely difficult to distinguish from a fastball until the last fraction of a second. Clayton Kershaw's slider has been one of the most consistently dominant pitches of the past 15 years. The key insight here is that the best sliders aren't the ones with the most break — they're the ones that look like fastballs through 60 feet and then move. A slider that breaks 15 inches but is visibly a breaking ball from the release point is easier to identify than one that breaks 10 inches but maintains fastball optics longer.

How to Evaluate Pitch Effectiveness Across Eras

One of the most common mistakes I see in casual baseball analysis is comparing raw velocity numbers across decades. A 92 mph fastball in 1968 is not comparable to a 92 mph fastball in 2024 because the context around it is completely different. Batter hand-eye coordination, track man data quality, batting practice philosophies, and even the composition of the baseball itself have all shifted significantly. The dead-ball era, the live-ball era, the steroid era, and the spin-rate era each produced different kinds of dominant pitches under different rulesets. When I'm evaluating a pitch's historical significance, I look at the on-base percentage allowed against that specific pitch type when it was in its prime, adjusted for park factors and league-wide offensive environment. This gives you a much clearer picture of actual effectiveness than counting strikeouts. A pitcher who held right-handed hitters to a .195 OBP with his slider in a 3.50 ERA era is having a more impactful performance than a pitcher who struck out 30% of batters with the same pitch in a 4.20 ERA era where everything was harder to get out. Another thing that matters is the countervailing adaptation. The best pitches are the ones that forced hitters to change their approach permanently. The knuckleball forced batters to accept a higher rate of contact variance. The split-finger forced catchers to become more active in game-calling because the pitch's downward trajectory required a different receiving angle. The modern slider forced the widespread adoption of the high fastball as a counter — you can't throw the same slider location to a batter who is sitting on it, so you have to mix with elevated fastballs, which opens up low-and-away locations, creating a chain reaction of tactical adjustments.

What Happens When the Data Doesn't Tell the Whole Story

I ran into a specific problem last year while helping a high school coach evaluate his pitcher's arsenal. The tracking data showed his changeup had excellent horizontal movement — 8.2 inches of tail, which was above average for that age group. But in games, batters were squaring it up regularly. The data was technically correct but functionally useless because it didn't capture the one variable that mattered: the pitcher was tipping the pitch by opening his hand slightly on the release point. A changeup with elite movement but a readable release is worse than a changeup with average movement and a closed release. I had the coach video the pitcher from the third-base side at 240 fps, and the tip was visible within the first five frames of release. We worked on a grip adjustment that closed the hand more consistently, and over six weeks the batting average against the changeup dropped from .340 to .210. The movement numbers barely changed. The tip was the entire problem. This happens constantly in pitch evaluation. The metrics tell you what the pitch did, not why it worked or didn't work. Spin efficiency, release extension, and break angle are all useful, but they're downstream of the fundamental mechanics that determine whether a pitch is actually deceptive. A pitcher who generates 2,800 rpm on a slider but has a delivery that's mechanically identical to his fastball is always going to struggle against patient hitters because the arm slot and release point give it away.

The Limitations of Any Historical Ranking

There is no definitive list of the best pitches in baseball history because the sport has changed too much. A pitch that was unhittable in 1955 might be easily solved in 2025 because of advances in hitting theory and technology. ThePED era inflated velocity across the board, making average fastballs look more dominant than they actually were relative to the hitting environment. The current emphasis on spin rate and launch angle optimization has made some historically effective pitches less viable — the traditional circle-changeup, for example, produces less horizontal movement than the now-prevalent split-finger change, which is why you see fewer pure circle-change pitchers at the top level. Additionally, survival bias skews our perception. We remember the knuckleballers who succeeded — Niekro, Tim Wakefield, R.A. Dickey — and forget the hundreds who tried the pitch and failed because it's genuinely one of the hardest pitches to control consistently. Only about 1 in 200 pitchers who attempt a knuckleball at the professional level make it to the majors. That doesn't mean the pitch isn't effective; it means the barrier to entry is enormous and most people never reach the skill level needed to make it work. If you're looking to build an effective arsenal today, the practical takeaway is to focus on deception and sequence rather than raw movement numbers. A pitcher with two pitches that look identical out of the hand but produce very different movement profiles will always be more effective than a pitcher with three pitches that all have distinct release points. The best historical pitches weren't the ones with the most impressive spin rates — they were the ones that forced batters to guess under conditions where guessing was always the wrong call.