By Bill "Two Scoops" Emes

Hall of Fame trainer Freddie Roach is raising questions about the durability of Sergio Martinez's chin. This Saturday night at New York's Madison Square Garden, Martinez (51-2-2, 28KOs) will defend his WBC middleweight title against Roach's newest star pupil, former three division champion Miguel Cotto (38-4, 31KOs).

Roach trained Julio Cesar Chavez Jr. for his fight with Martinez in 2012. Martinez dominated the action for eleven rounds, but he was hurt and nearly knocked out in the twelfth. Roach says Cotto is a bigger puncher than Chavez, and believes the Puerto Rican star will end the fight with the first major shot that lands.

"If you let your hands go he's hittable and he don't have that good a chin. Chavez is a not a big puncher. He's a pretty good puncher, but not as good as Miguel. When Miguel hits him once it's over," Roach told BoxingScene.com.