Horse Racing is the only sport to have 2 channels but the least viewers.
NFL, NBA, MLB, Golf are exclusive to their one and only network though they have their own flaws too.

For example: I live in Houston, I paid 179 dollars for NBA league pass on dish network and I can watch every single NBA game in the country EXCEPT for the Houston Rockets. Rockets signed a deal with Comcast so all their games are exclusive to them only.