LAS VEGAS (AP) -- Two-time Olympic champion Guillermo Rigondeaux stopped Rico Ramos at 1:29 of the sixth round to take the WBA super bantamweight title Friday night at The Palms in just his ninth professional fight, a record for fewest bouts en route to a major world title.
The undefeated Cuban defector floored Ramos in the first round, had control throughout and ended it with a left hook to the body.
Also, Joel Diaz Jr. overcame a second-round knockdown to stop Guy Robb at 2:20 in the seventh round of a super featherweight slugfest. Diaz knocked down Robb twice in the third round and forced the referee to stop the fight after landing multiple power shots in the seventh.
Earlier, Mathew Villanueva stopped Michael Ruiz Jr. in the seventh round in a super bantamweight fight.