Lil Wayne is blaming an "unrelated 3rd party" for screwing up his plans to perform at the Mike Tyson fight -- telling TMZ Sports there's no bad blood between himself and Triller.
Our Weezy sources tell us the rapper cut short his Thanksgiving weekend celebration with his family in Louisiana so he could be in L.A. to perform at the fight -- and he DID actually make the trip out.
But something went wrong on the day of the fight leading Wayne to bail on the entire event.
So, what happened?