If the save file is corrupted you can't do anything unless you made a backup of the file
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Once a content or save file is corrupt you will be unable to restore it. For some reason this happened to a lot of users playing NBA 2k13.
Next time takes steps to ensure your files are safe
1) Do not turn off your consoleduring any saving process.
"Saving, please dont turn off your xbox 360 console."
2) Backup your files or make multiple saves.