Originally posted by NihilistHe doesn't have to make a deal with the devil(which he has on multiple occasions) to get beat.
Mephisto doesnt have any feats to say he could beat Thanos in a. Straight up fight outside his own realm, Thanos wouldn't agree or fall for any of Mephs deals that would allow him to get beat.
And why is mephisto even in his discussion? In case you guys don't know whatever crossover those two were in is not canon.