Based on my experiences, and I shoot mostly sport, you are way too late already. Being on right place at right time, means photo is hot for next few hours. Noone cares about that photo after day or two anymore. It's not news anymore. And even if it still is, they already published it with some other photo or even without photo, so they don't need your anymore.
Otherwise call to sport editor of newspapers you think they would be interested, and tell him/her what you have. And at same time, you should know for how much you are willing to sell this photo. "I don't know yet, I will get back to you later after I found out" is wrong answer to his how much question 
And one more tip, just that you won't be too disappointed. Editors normally have different way of thinking as you might have. So what looks so great and so important to you, might not be worth much to them. So most of time, they don't feel like dealing with 1000s of people who bug them everyday with "great moments caught by them". That's reason why you should forget about mail. Normally you don't even get reply. If you think your photo is really so special call rather then send mail.
And another tip.... sell it, don't give it for free. Every newspaper or magazine has budget for photos... even if they say they don't have it 