An MLB fan sustained significant injuries in a fall from a PNC Park outfield wall on Wednesday night ... and the scene was so horrifying, Pirates manager Derek Shelton asked afterward for "everybody to keep him in their prayers."
The terrifying situation unfolded in the seventh inning of the Pirates vs. Cubs matchup ... when a man jumped up from his seat in right field -- and then suddenly tumbled all the way to the warning track that was roughly 20 feet below him.