!!There wasn't! It was all about how well Martina played with her attacking style! If the court was fast or bumpy like on grass, Navratilova had a better chance of winning, while clap and slower HC gave Evert more of an opportunity to make life miserable for Martina with passing shots and precision lobs! There were no secrets or surprises after just a few years of comp.! People probably don't remember they traveled together, practiced, and had dinner!
Do you think there's ever been anyone as consistently professional and competitive as Evert in the history of tennis on the men's side? Federer and Connors had a good crack at it, but maybe Rosewall is the best bet. I think she just might be unsurpassed!