A computerized strike zone could be on the way to Major League Baseball. The umpires union struck a deal with MLB officials last weekend to cooperate and assist with the implementation of a digitally governed strike zone as part of a larger contract, according to a person with knowledge of the deal.

Players, coaches and fans have clamored for such a reform after a heartily scrutinized postseason of officiating that saw baseball fans and observers calling their own balls and strikes, often at odds with umpires decisions.

With game telecasts now routinely including a strike zone projected on the screen, fans can decide for themselves after each pitch whether an umpire was correct, with controversial rulings casting a shadow over a game thats already grappling with other structural issues, including pace of play and rising strikeout and home run numbers.

The five-year agreement between umpires and MLB, part of a new labor deal first reported by The Associated Press, provides umpires significant increases in compensation and retirement benefits designed to let older umpires retire sooner. In exchange, the umpires will advise Commissioner Rob Manfred on the development and implementation of ABS, the leagues proprietary automated balls and strikes system developed by sports data firm TrackMan.

The independent Atlantic League, an eight-team minor league unaffiliated with MLB franchises, piloted ABS in 2019, judging the experiment a great success. MLB deployed the system in the Arizona Fall League in September and October, and will test it again this spring and summer in the Class A advanced Florida State League.

A source with knowledge of the systems rollout said Manfred is eyeing activating the digital strike zone in the big leagues in as soon as three seasons.

The agreement with umpires, if all goes according to plan, will help push baseballs officiating into the 21st century. Where every other aspect of baseball has been quantified down to a science there are bioengineering labs designed specifically to calibrate pitchers form and batters swings the strike zone, the games very foundation, has always been subject to human biases.

Umpiring a professional baseball game is staggeringly difficult, and major- and minor-league umpires are the best in the world at their jobs. But they still get a great number of ball and strike calls wrong. A 2019 study from Boston University that examined 11 years worth of MLB ball/strike calls found umpires get approximately one in every five calls wrong. (That sounds like a lot, and it is, but remember that umpires dont make a call on every pitch. There are foul balls, balls put in play, check swings, and so on, leaving far fewer ball/strike calls than total pitches.)

Umpires have especial blind spots in some areas of the strike zone, the study found. They miss calls at the bottom left and bottom right portions of the strike zone, the most important parts of the zone, 14.3 percent and 18.3 percent of the time, respectively.

Simply put, ABS and get used to saying that wont miss those calls. But it will reconfigure the modern conception of the strike zone. For one, its zone is larger than the one imagined by most players and fans. The K zone projected on television is one dimensional. It looks like a narrow window through which a pitcher must fit the ball. But the real strike zone is three dimensional. All a pitch must do is skim a piece of that zone to be called a strike. ABS doesnt have blind spots.

That means the high fastball or looping curveball most umpires considered out of the zone may very well be strikes, according to ABS. Advantage, pitcher.

However, the fastball that tries to paint the inside corner of the plate, or the slider that tries to sweep outside and misses by half an inch wont be strikes in an ABS zone no matter how well a catcher presents the offering. Advantage, hitter.

Beyond the technological improvements, paying umpires more and allowing them to retire earlier should improve the standard of the officiating workforce. The BU study found the best umpires on balls and strikes are younger and average fewer years of big league experience. Of the top 10 umpires between 2008 and 2018, all of them were younger than 40. The most experienced had only been in the major leagues for five years. The worst umpires were all 50 or older and had spent an average of 20.6 years in the majors.

MLBs umpiring corps must get younger. The average age of a major league umpire is 46, around the age when performance behind the plate starts peaking. The umpiring corps is entirely male and almost entirely white, too. Increased compensation could be a strong motivator for more diverse candidates to pursue the profession, though MLB and the umpires union also need to increase their diversity outreach. Professional baseball is one of the most racially and ethnically diverse sports in the world. Its officials dont reflect that diversity.

Opponents of the digital strike zone need not worry too much: This is not the end of umpiring as we know it. ABS still requires a home-plate umpire to administer the game. The software is not nearly advanced enough to make complex safe or out calls on the bases. MLB wont be cutting any umpiring jobs.

When the ABS system is implemented, home-plate umpires wear an earpiece connected to an iPhone in their pocket. That connects via WiFi to TrackMan radar systems installed in the ballpark. The software announces Ball or Strike to the umpire, who announces the call to the players and crowd. It feels and looks like a normal baseball game.

But this would be arguably technologys largest integration into the officiating of major American sports, which have lagged behind the rest of the world in that category. European soccer employs goal line technology to determine indisputably whether a shot has scored. Tennis has the Hawk-Eye instant-replay system which tracks whether balls are in or out. Cricket uses Hawk-Eye for a complex and controversial call, leg before wicket, which is considerably more advanced than a digital strike zone.

ABSs successful rollout could lead American sports fans and executives to consider the merit of even more officiating technology. Perhaps technology could help determine if a batted ball was fair or foul, a home run or in play? In basketball, whether a ball was out of bounds? In football, whether a runner achieved a first down or a touchdown?

For Major League Baseball, ABS is a far less intrusive technology than opponents of robo umps once feared. But it would reshape the game and its officiating.

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