Ok who would this...O and i used the search and googled it but i didnt find anything on this website but i could be mistaken because i feel like this would be a popular idea so im sorry if this has been done.
Round 1: Thanos has 30 min prep
Round 2: Thanos has 1 hour prep
Round 3: random encounter NO knowledge of eachother
Both are bloodlusted, both can only bring themselves (no clothes or gadgets etc)
fight takes place on a deserted earth, fight to the death, no BFR