Where does this come from, and can I check it?

It started with home run calls and expanded to most plays by 2014. The figure is taken from Major League Baseball, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a sports fact?

Yes. It sits on the Sports shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Baseball began video review in 2008

It started with home run calls and expanded to most plays by 2014 Managers initially could not challenge, and umpires asked for review only on boundary calls. The 2014 season brought manager challenges, with one available and a second if the first was upheld. Reviews are decided by a replay crew rather than the umpires on the field. It sits in Mondo's sports collection, one of 200 facts that each trace back to the reference below.

Where this comes from

Major League Baseball

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

Go further

Technology trivia

More facts like this

The strike zone spans the width of home plateIt runs from the knees to a point midway between shoulders and belt Video reviews reached Test cricket in 2008The Decision Review System was trialled in a series between India and Sri Lanka Cal Ripken Jr. played 2,632 games in a rowHe passed Lou Gehrig's long-standing baseball record in 1995 A baseball pitcher's mound is ten inches highThe rubber sits 60 feet 6 inches from the back of home plate The designated hitter arrived in 1973The American League let a batter replace the pitcher in the lineup that season Baseball settled on nine innings in 1857The first convention of baseball clubs fixed the length and other rules

Tags: baseball, technology, umpiring

Baseball began video review in 2008: the short answers

Where does this come from, and can I check it?: It started with home run calls and expanded to most plays by 2014. The figure is taken from Major League Baseball, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a sports fact?: Yes. It sits on the Sports shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.