I don't remember ESPN having one at the same time although I'm sure they did. But it was kind of fun to switch back and forth between Skip and Harry on those afternoon Braves/Cubs games from Wrigley.
Speaking of, does anyone else remember Ted Turner pushing MLB to try to get them to allow a WTBS broadcast of the 1982 playoffs vs. St. Louis? Of course MLB said no, but it was uncharted territory at that point since only the Cubs had a similar internally based TV outlet that could cover them. If you go on YouTube and watch some of the clips from the locker room after the 82 team clinched the division you can hear Skip referring to it...something to the effect of "we'll let you know soon if we're able to bring you the games from St Louis."