Another commenter mentioned the stock market report. Again, easy reliable filler material. Despite the fact that the Dow Jones Industrial Average has a tenuous effect at best for the vast majority of people, and despite the fact that it's not a great overall economic indicator, the news media report it because it's easy, and it changes daily.
Truly "newsworthy" stories are not guaranteed to happen every day. But the news media still need to fill space regardless. That's why they love things that reliably change on a daily basis. "Team A beat Team B" is such an easy story to write. It practically writes itself. Compare with true investigative reporting, which is extremely difficult, may take months or years, and may or may not have publishable results. How much investigative reporting can you do and still have a daily news report?
Why does the news media always cover elections as if they were horse races (and inevitably lament that in retrospect with crocodile tears for exactly 1 week after the election before forgetting and doing it again the same way the next election)? Because it's easy. You could say lazy. Candidate A is up in the polls this week, Candidate B is down. Such an easy story to write. You can keep taking polls, and keep publishing polls, and you've filled a bunch of news space cheaply.
Don't even get me started on how the "news" is now largely publishing tweets written by other people. The ultimate in journalistic laziness.