John Coomer's lawsuit said he suffered a detached retina and other injuries when he was struck in the eye by a foil-wrapped hot dog thrown by Royals mascot Sluggerrr at a 2009 game, The Kansas City (Mo.) Star reported Tuesday.
A jury ruled for the team in March 2011, saying Coomer assumed the risk of a hot dog-related injury when he purchased his ticket to the game.
However, the appellate court threw out the lower court's decision.
"The risk of being hit in the face by a hot dog is not a well-known incidental risk of attending a baseball game," the court ruled. "Consequently, a plaintiff may not be said to have consented to, and voluntarily assumed, the risk by attending the game."