The 30-year-old Sanchez (21-0, 14 KOs) became the fourth heavyweight to stop Puerto Rico’s Negron (25-4, 20 KOs) inside the distance.

The Cuban-born Sanchez (20-0, 13 KOs) is listed by most sportsbooks as at least a 25-1 favorite to beat Negron, but Caicedo considers them close in skill

The unbeaten Cuban sits at No 3 in the WBO rankings, just behind Joyce and Parker, and will be watching closely as his heavyweight rivals battle