It was a romance novel from the 80's the man's name was James Tyler Morgan Jr. and the female's name I believe was Danielle, he was a baseball player and she was one of the owners of the team. I believe the title was Rough Diamond

You are in luck!! Rough Diamond by Brooke Hastings! (I used to work for a book distributor, and luckily I still have access to their lists.) LOL. Rough Diamond by Brooke Hastings (http://www.fictiondb.com/author/brooke-hastings~rough-diamond~17216~b.htm)