Luna appears to be ready for a step up in competition on future cards .
Alejandro Luna 19 - 0 14KOs stopped an overmatched but game Sergio Lopez 18 - 10 - 1 12KOs at 34 seconds in the fourth round .
Alejandro Luna appears to be ready for a step up in competition on future cards .
Alejandro Luna 19 - 0 14KOs stopped an overmatched but game Sergio Lopez 18 - 10 - 1 12KOs at 34 seconds in the fourth round .