So my editor wants me to use a flash when i shoot sports, I don't get it and so far haven't. I think it looks unnatural and leaves harsh shadows. He said it will allow me to shoot with a lower ISO and reduce the graininess of the picture, which are being printed in the newspaper and he is worried about graininess of 800ISO. I am going to not use a flash as long as I can so far he has said he likes them.
This is the photo they printed, I don't think it is too grainy.