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I know what you're thinking. The commentator who never stops talking? How can he be on this list?
Well, it just happens that perhaps his non-stop talking is what's likable. As a commentator, he divulges all the knowledge that he holds regarding the game of tennis (but just enough, as he wouldn't want to confuse the average fan).
Regardless though, he still creates the sense of a being a know-it-all, which, mind you, is a good thing and causes the viewers to feel comfortable with listening to him. Maybe the fact that he's an avid sports fan, and doesn't stop with the analogies with other sports to relate viewers to tennis, has something to do with it.
Like when he says, "That's a yellow card in the coaching department" when referring to Garcia-Lopez's stubborn game plan in serving to the backhand of Murray at the Aussie Open, there's no way on earth that you'd feel uncomfortable with him talking.