Wilder?? He's good at knocking out tomato cans and glass jawed mediocrities like Szpilka, Molina, et al, but an iron chinned fighter like Valuev? No way. In fact, that china-chinned fraud likely gets knocked out himself. If feather-fisted Fury could do it, so can Valuev. Oh, and dont bother talking about overrated heart patient Grandpa Ortiz or his fellow geriatric mediocrity Stiverne. The idea that these establish this fraud as some heavy hitter is as phony as his ability to take a punch.
I think that no one. While when Valev was old and his joints problems hyped up even more, like from fights vs Holyfield and Haye? This Valuev version not likely might land on Wlad something cos he was slow. Something like 120-108 UD for Wlad. Valuev was damn large and durable. Very slow. Really very slow, especially when he was in the end of his pro career.
A powerful Wlad left hook from a good angle might drop the beast. Maybe If Valuev stepped in towards such a shot with his Weight on The front foot going forward. A perfect shot with perfect timing from them both. I doubt it in reality.
The idea that any puncher in history would "for sure" knock down Valuev is comical. All of the listed fighters went the distance with certain opponents or couldn't drop them and Valuev is freakishly tall, heavy and durable, even by modern standards. Wlad would probably have the best chance, maybe Wilder but I wouldn't bet on either of them.
Liston & Foreman would batter him I could see 92-93 Bowe pummeling him as well. The Klitchskos obviously have a shot as well. Valuev may shell up after taking some shots from Tyson in the first and go into some sort of survival mode Lennox Lewis as well
Lennox Lewis would have knocked him out. Wlad would be too cautious. Vitali maybe but he wasn't a one punch threat. Either could win a decision. Foreman too old and nobody today. Wilder might have a punchers chance but would duck the fight.