Breaking Down Baseball’s Early Velocity Surge

Pitchers are scary. I know this because I recently watched an outing by Matt Brash, who, despite his nonexistent command that day, used a scorching heater and two breaking balls to stymie a formidable Astros lineup. He walked six, but those free passes went along with five strikeouts and just two hits allowed. The Mariners won by a score of 7 to 2. So it goes.
Pitchers are scary, and they’re getting scarier, in large part because they’ve developed the ability to throw harder and harder. It probably doesn’t even bear repeating at this point, but because it’s the subject we’re on, let’s refresh ourselves. Back in 2008, the first year with PITCHf/x data, pitchers averaged 91.8 mph on their four-seam fastballs. Last season, they averaged 93.8. That the league as a whole has gained two miles per hour is indicative of substantial change.
It’s 2022 now. It’s early, but so far, pitchers have been averaging 93.9 mph on their fastballs, for an uptick of 0.1 mph. Such a small difference might not seem like much, or something we should focus on right now. But this is merely a cursory glance. We haven’t even separated the starters from the relievers, and it’s the latter group that most people associate with triple-digit wizardry. Are bullpens hiding the fact that rotations aren’t quite stretched out yet due to an abbreviated spring? Let’s find out:








