Prosecutors have hit Tony Ferguson with a charge of DUI after he allegedly wrecked his truck in Hollywood last month, TMZ Sports has learned ... but we've also learned the UFC star is already fighting back in the case, pleading not guilty to the misdemeanor.
The 39-year-old entered the plea at his arraignment last week ... less than a month after authorities say he crashed his pickup truck into two parked cars outside of a Hollywood club just before 2 AM.
DRUNK AND DANGEROUS ONSCENE.