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You can ad various advertisement types, the issue though, what to sell on a sports site. Anything with team logos comes to mind, though not a big payer, you could advertise select Amazon products, not doubt there’s plenty of fan material there.
A back door method to find out what can be advertised, place adwords blocks on your site, google does an analysis of th text on each page and inserts the available ads that bet matches the page, you can find affiliate marketed versions of the same products that make better advertising income.
And survey the ads appearing on other sports sites…