Mentally, above all. And we know that one of Joshua's weaknesses Is just his mental resistance (besides his suspect recoveries if he gets punched). Thats what Bellew has said about Usyk: "He mentally exhausted me in our fight by constantly having his front foot close to mine. "That doesn't sound much. But it's mental pressure that he puts on you, not physical. "He wouldn't get involved in any wrestling matches with me. Every time we got close, I would dig him to the body. "He's vicious and brilliant." Usyk has mocked doubters who questioned whether he can compete in a higher division against physically superior champions such as Joshua". Thoughts?