Center fielder David Dahl, widely regarded as one of the two best prospects in the Rockies organization, will miss the remainder of the 2015 season after undergoing surgery to repair a “massive laceration” on his spleen, reports Yahoo’s Jeff Passan (Twitter links). As Passan reported yesterday, Dahl suffered a serious spleen injury as well as a likely concussion in a truly frightening outfield collision. He will have to wear some form of protective padding for the rest of his career as a result of the injury, according to Passan.