Review: Playing the Field by Jannette Rallison

From Goodreads:

Thirteen-year old McKay is a talented baseball player, but as equally untalented when it comes to algebra. If he doesn't bring his grade up, his parents threaten to make him quit the team. His best friend Tony thinks the natural solution is for McKay to befriend Serena, a pretty girl in class, who also happens to get straight A's in algebra. Not only will that get McKay the tutor he desperately needs, but it will give Tony the chance to flirt with Serena's two best friends. Unf...