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Among the many, many highlights of Aaron Judge’s Home Run Derby carnage was a moonshot that didn’t count—because it smacked off the girders that form the roof at Marlins Park. That wasn’t supposed to happen.

In his column, Tom Verducci explains that when Marlins Park was built, they wanted to avoid the confusion and amateurishness of Tropicana Field, which wasn’t built for baseball and which has weirdly specific ground rules for when balls frequently bang off the various levels of catwalks above the field. The Marlins wanted to make sure no ball would ever hit their roof, so they mathed it out:

Back when the engineers from Walter P. Moore were designing the retractable roof of Marlins Park, they set out to determine how high the roof would have to be so as not to interfere with balls in play. They studied the air density and temperatures of Miami and plugged those variables into equations from NASA. Then they wrote an algorithm “to generate a volumetric approximation of all the possible batted ball flight paths” and then applied it to their Building Information Modeling to determine the final geometry of the roof structure.

The engineers finally arrived at a height of 210 feet above the ground at its apex (above second base) to make sure no batted ball hit the roof. It tapered to a low of 128 feet above the ground in deep right-centerfield.


The Marlins were forced by MLB to come up with ground rules on the off-chance someone came along that the models couldn’t anticipate. Their solution? Any ball that hits the roof at Marlins Park is still in play, oddly enough. It can even be caught for an out. It sounds like they half-asssed the rule because they didn’t expect to ever invoke it.

Well, you know how things went on Monday. Judge hit the roof twice, once in batting practice and once in competition.


That BP one was well up into the roof girders. And Judge’s shot in the first round?

The Marlins estimated that it cleared one girder and smacked against another at a height off the ground of about 170 feet in deep left-centerfield. Think about that: about 17 stories high after traveling about 300 feet.

Team officials suddenly had to dust off the obscure ground rule that had never been used before and had largely been forgotten. The blast was determined not to be a home run, making it the most massive fair ball ever struck that was not a home run.


Aaron Judge is something special.


Deputy editor | Deadspin

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