Putting it simply.

CBS has March Madness, the NCAA basketball championship tournement.
ABC has an NBA game with the Lakers at the Cavs (the Cavs won by a single point).
NBC has professional golf.
Fox has NASCAR.

Pax had infomercials. PBS has pledge week with WKAR doing something on old people living longer.

Late afternoon has it all thrown up into the air but I am not talking about that.