... because Teofimo Lopez tells TMZ Sports he has no interest in running it back with Vasyl Lomachenko after kicking his ass on Saturday.

"For what? F*ck him," Lopez tells us ... "I won fair and square."

He certainly did -- Lopez dominated the first half of the fight and ended things with a stellar 12th round, despite a furious comeback attempt from Loma.

After the fight, Lopez says Loma and his camp weren't exactly gracious in defeat.

"I went up to him and I said good fight. I grabbed his father, I said safe travels … pretty much saying goodbye to them because I knew I won."

"But he didn’t want to give me back that same gesture -- instead he just started laughing like, 'What am I doing here?' So, I was like whatever, I did my part. The fighting's done, I whooped your ass … you cut me, head-butted me and sh*t but it's fine."

Lopez says Loma blew off the post-fight press conference and refused to talk with media -- telling us, "That just shows what kind of champion he really is."

So, what's next for the 23-year-old champion?

"I'm the king now," Lopez said ... "I've always been the king. I was just the underground king. Now, I've been crowned."

We asked Teofimo if he has any interest in fighting rising stars like Ryan Garcia and others now that he's in the driver's seat -- and ya gotta hear his answer.