Keith Thurman is back ... and if you don't like it, oh well -- 'cause One Time says he is what boxing has been missin' and doesn't give a damn what the haters have to say!
TMZ Sports spoke with the 30-1 welterweight fighter ahead of his March 30 bout against Tim Tszyu (24-0) at the T-Mobile Arena in Las Vegas.
It will be his 3rd fight in the last four years ... so you can understand why many don't believe Thurman will come back and be his old dominant self, but he doesn't care.