Baseball Replay Systems: How MLB and KBO Challenges Differ

Baseball's video replay system, first implemented in Major League Baseball in August 2008, has evolved significantly. Initially limited to verifying the status of batted balls, whether fair or foul, home runs or off the fence, or if fan interference occurred, its scope has broadened considerably.

Today, the system encompasses calls on the bases, including safe or out rulings, as well as judgments on obstruction during baserunning or defensive plays. The manager's challenge system, allowing teams to request a review, was introduced in MLB in 2014.

In the Korea Baseball Organization (KBO) League, a similar video review system, initially called 'umpire collaborative review,' was first introduced in the latter half of 2014. Unlike MLB, which operated its video replay headquarters from New York from the outset, the KBO did not establish its dedicated video replay center until 2017.

A striking difference emerges when comparing the atmosphere surrounding challenges in MLB and the KBO League. MLB utilizes a video room located behind the dugout, enabling immediate communication via intercom. If a potential for a reversed call exists, a challenge can be swiftly initiated. The KBO, however, lacks this integrated system, potentially leading to a less fluid or decisive process when reviews are requested.