Yup. True. I have some inside info were I work with some sports people

Costner was staying at Cal's mansion. On gameday Cal left for the stadium, forgot something, went back, and found Kevin banging his wife.

Cal flipped out, punched the shit out of Costner, and was then running way late.
The Orioles and stadium crew made the excuse of an electrical problem for delaying the start of the game so Cal could make it...
Of all the women Costner could have, he chose his friends wife..
That said, this story is great! Love the Field of Dreams thing. And as Justin said, it being a good game and Yankees losing made for a special night of baseball.