I actually wrote them one time expressing my disgust for their lack coverage of actual tennis matches. I got a nice little email back saying thanks for responding and listing all the coverage they have.
Look at their coverage today, Miami is a masters and one of the biggest tournaments in the states and they cant even bother having a match on all day.
This is why people stream these matches, of course its almost impossible to find any streams right now until the weekend. Bet365 usually comes through but not with Miami. Tennis tv won't have anything until the weekend either.