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The last time I watched baseball was in 2012, and there has been more frequent pitching changes, especially in the post-season.

For instance, this NY Post article states:

In 2018, teams set a new record by averaging a combined 8.41 pitchers per nine-inning games, according to data provided by Major League Baseball. That broke the previous mark of 8.20, set in 2017, which surpassed the standard of 8.00 established in 2016, which … you get the idea. Clubs teamed to use an average of 6.91 pitchers in 1999, and here we are now.

Why is this?

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If by "recent" you mean "since 2012", yes it's up, but I would say it's just a continuation of a trend that has been going continuously since the 1980s. At least in part due to this trend, in 2020 rules were added that force a pitcher to face a minimum of three batters in most cases before eligible to be replaced. 2020 is an odd year for many reasons, and I haven't seen stats for how the changes have affected this trend.

Jim Albert has a blog with a nice article on historical pitcher usage. One piece that is particularly telling is a graph of average pitchers used per game:

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What's the cause, though? Nate Silver has a piece at fivethirtyeight that points out that pitchers are more effective when they only pitch one inning. They can exert more effort for that inning and the strikeout rate goes up. Good for the individual pitcher and that team, but drives the arms race toward more pitchers and especially more relievers.

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