What kind of sports? Most sporting events don't allow tripods for safety reasons and are really not practical. I've shot pro sports for over 30 years(NFL) and only monopods are allowed. Same with baseball, and basketball not at all. Ball heads are not very practical on m-pods. Also, what size lenses are you using that would require a ball head.
What kind of Head would you suggest that I get for a Monopad to be used with a Canon 70-200 f2.8L IS Lens?Also,could you please suggest what Brand and Model?