I wouldn't say Khan. To me Khan gets woobled with punches other boxers are able to absorb. Boxers who can and have taken a beating are Provo, Rios, Margarito, younger Mayorga, Ike and Tua from their epic fight.....are some of the guys that comes to mind.
Margarito and Castillo were insanely tough Bradley's deceptively tough Froch was tough as nails Hopkins showed great toughness against that beast
Seconded. The punishment he took against Matthysse would have KOed a hundred boxers. The guy definitely made a deal with the devil.
Danny Garcia, Lucas Matthysse, John Molina Jr, Adrien Broner, Ruslan Provodnikov, Mauricio Herrera 140 is full of guys who can take a good thumping.