hey tex.
usually when this happens your disc is permafucked; believe me i've done it to a few in fits of rage, usually it's FIFA.
supposedly, every once in a blue moon, getting the disc resurfaced at a video/dvd/game store for 2 dollars in those machines they have works, but this is very rare. I've only heard anecdotal evidence of this being successful; never worked for me
If the game is made by EA sports, you can mail the disc back to the manufacturer along with a check 20 dollars and they will send you a new one. This is what I have done, and one time they didnt even cash my check. I imagine there is a similar offer from other game manufacturers, so you should check the booklet that came with your game and see if it mentions anything on the last page about what to do with a damaged disc.