Introduction
This short article continues my effort to articulate some of the observations I made during my visit to Spring Training, 2026.
Short Topic of the Day
I will start out with showing my bias. I’m a fan of the system. Although I’m an old guy, I tend to like new technology. I’m not a leading-edge adapter, but more the fast-follower type. This tech I like.
Since many of you haven’t seen it, I’ll describe it in hopefully not so many words.
All MLB stadiums are equipped with Hawkeye technology that tracks (in very small increments, it turns out) the flight of the ball. It is tuned to register if the ball passes through the strike zone. In days of yore, when mortal humans calling balls and strikes, the strike zone was an amorphous cube, where umpires would judge if a ball crossed any part of the plate (front or back) while in between the players knees and the letters. Each of these positions is open to some interpretation and judgement.
But now, Hawkeye evaluates 0n a two-dimensional plane. It looks to see if the ball crosses the plate only along a line that runs between the two back corners of the plate. Ergo, a pitch that might look a tad high to the hitter in the strike point (out near the front of the plate) could actually drop in the zone 8.5” later and be viewed by Hawkeye as a strike. The second dimension eliminates knees and letters and now just uses 53.5% of the player height as the top of the zone and the bottom is 27% of the same measurement. So the judgement of strike or ball by the ABS system is two-dimensional, whereas I suspect umpires will still tend more toward a 3-dimensional view that will naturally look more like an egg than a rectangle.
A pitcher, catcher or hitter may challenge, but must do so immediately, without assistance or encouragement from anyone else. They are to tap their head AND verbalize their challenge. Each team gets (theoretically) unlimited challenges during a game but loses the right to challenge if they have challenged unsuccessfully on two occasions during the game. The right to challenge is restored in any extra innings.
The actual challenge is quite interesting and seems to engage the fans a fair bit. The player taps their head, the umpire announces the challenge and all eyes turn toward the scoreboard. The strike zone and the ball location are displayed, along with a measurement of how far into or out of the zone the ball was. I didn’t time it, but I’d guess it takes in the area of 5 seconds or so. Pretty quick. The umpire announces the impact of the ruling (upheld, changed to ball or strike, and revised count). Then play resumes. The fans seem to really get into it. The umpires? If body language means anything, not so much.
For folks who watch the game on their chosen video device, I understand that the strike zone displayed during the broadcast will be one and the same with the two-dimensional Hawkeye view presented on the scoreboard.
I saw one game this past week where CB Bucknor was challenged multiple times and proven right more than not. Wouldn’t it be ironic if ABS informed us that CB is a better umpire than we had imagined? Another umpire went 0-6 on challenges, finally breaking the streak on, ironically enough, the last pitch of the game.
The Cardinals are encouraging their players to challenge during ST. It seems like it will be a good tool for them to learn the edges of the strike zone in real time. I am sure in regular season there will be less freedom to challenge. It would not shock me if only a few hitters are allowed (Nootbaar, for one). Otherwise, the onus might rest mostly on the catcher. I can see hitters having some freedom in crucial points of the game. I forget who, but we saw a hitter challenge a 3-1 call, in the rain, in the midst of a 10-2 game. That probably won’t reach the “crucial” threshold during regular season.
Most of the pitches that got challenged were truly borderline pitches that in the human umpire world could go either way. Several strikes were called on balls that were measures as “less that .1 inches” outside the strike zone. Likewise, you see some balls that get reversed to strikes as they just nick the zone. .1 inches. Wow! Our past time is no longer a game of inches, it is a game of millimeters.
I don’t get the sense that framing will be altered a lot by ABS. Seems like only 4-5 calls per game get challenged, whereas framing can affect the outcome of quite a few more pitches. That is my estimation, but we will have to wait and see.
For those that haven’t seen it, Baseball Savant has an ABS leaderboard page at www.baseballsavant.com/ABS. Take a look.