Deontay Wilder is considered by many the HARDEST PUNCHER of all time ... but Tyson Fury says that's B.S., 'cause he's faced someone who hits harder.
TMZ Sports talked to 31-year-old Fury Thursday afternoon, days before his rematch with Wilder ... and we asked about the Bronze Bombers legendary power.
"I'm not so sure [Wilder's the hardest puncher ever], I'm not so sure. He hit me with his best shots, I got back up again. I think Wladimir Klitschko was a massive puncher.