Sports Related Articles getting syndicated by directories question

Try submitting a few of them, to start with, and see what happens? There's not much downside.

If they're really good quality content, and original material not available elsewhere, and publishers in the niche want to share them with their own readers/visitors/subscribers, they might well gradually get syndicated? For what it's worth, it's definitely a niche in which people do syndicate content.

Anything that's already indexed on your own site, you can add on a short resource-box and just submit to EZA "as is". (Suggestions: it's ok to change the titles if you want/need to, but don't "re-write" the articles at all; don't give them any unique content; don't make your resource-box too "salesy", if you want people to syndicate them and include it. Don't try to rank your site for the words "click here" or anything that comes across as a "salesy call to action": the lower-key it is, the fewer potential syndicators it will put off. Just saying ...).

Bear in mind, though, that this would be only an attempt at "passive syndication", which is inevitably slower-moving, variable, unreliable, etc. etc. (Still worth trying!). You generally have much better chances with "active syndication" instead/as well, but of course that's much more work and more time-consuming. Good luck.