Evelyn Jones (plaintiff) was a fan of the Pittsburgh Pirates baseball team. She attended the inaugural day at the Pirates’ new stadium, Three Rivers Stadium. The stadium was managed by Three Rivers Management Corp. (defendant). The new stadium, unlike the old stadium, Forbes Field, had an unprotected, internal walkway. When Jones was on the walkway, she was hit in the eye by a baseball. Jones sued. At trial, Three Rivers argued that Jones had not established a prima facie case of negligence or, in the alternative, that Jones had assumed the risk. The jury found in favor of Jones. An intermediate appellate court reversed. Jones appealed to the Pennsylvania Supreme Court.