Seems like Cotto was relentless with that left hook which may have numbed that particular side of Yuri's body and tightened up his legs.
This could've led to the slippage and eventual KO.
Without a doubt, Cotto's left hook to the body is one of the most potent forces in the sport today.
cotto didnt really throw 2 many left hooks to the body in that fight, he threw like 5 or 6 that i seen, and it was yuri's knee that gave out not the ankle. also no i didnt think his hooks softened yuri up to slip.