David Benavidez dismantled Gilberto “Zurdo” Ramirez on Saturday, stopping the Mexican with a stunning combination to win the WBA and WBO cruiserweight titles. At T-Mobile Arena in Las Vegas, Benavidez dropped Ramirez in the fourth round and again in the sixth, with the latter knockdown proving decisive. The first knockdown came courtesy of Benavidez’s trademark, rapid flurries – one against the ropes and one out in the open – with single, heavier shots mixed in. David Benavidez (left) stopped Zurdo Ramirez to become a three-weight world champion (Getty) It was a left hook that finally put down Ramirez on that occasion, badly damaging his eye as well, but the 34-year-old was saved by the bell before battling through the fifth round. But late in the sixth frame, Benavidez fought his way off the ropes and dug a right hook to the body, before unleashing a rapid-fire eight-punch combination. That froze Ramirez, who then ate a left hook, a right, and one more of each.…