Photos/Weights: Calderon-Rivas, Vazquez Jr, Bopp, More

GUAYNABO, PUERTO RICO - former double world champion Ivan "Iron Boy" Calderon and his rival, Felipe Rivas, had no issues at the official weigh-in for Saturday's clash, which headlines "Night of Champions" - being staged by PR Best Boxing Promotions (PRBBP) as part of the 24th Annual Convention of the World Boxing Organization (WBO). The card will also feature former world champions Wilfredo Vazquez Jr. and Roberto "Mako" Leyva and world champion Yessica Bopp.

Calderon (34-2-1 and six KOs), former WBO champion at 105 and 108 pounds by the WBO, returns to the strawweight division. He came in at 104-pounds, while Rivas (11-8-1 and five knockouts) was also 104 pounds. Ten rounds for the WBO Latino title.

Former WBO super bantamweight champion Vazquez Jr. (20-1-1, 17 KOs) scored 124 pounds on the scalre for his ten-round bout against former world champion Leyva (27-13-1 and 21 KOs), who weighed 125.

Meanwhile, Bopp (17-0 and seven knockouts) weighed 107 pounds for her third defense of the WBO junior flyweight title, while Suzanne Warner (9-10-1 and two KOs) was 105 pounds.

Hard-hitting Jorge "Destroyer" Melendez (20-2-1 and 20 KOs) stepped on the scale at 153.25 pounds WBO Latino junior middleweight title clash against Eric Mitchell (23-7-1 and 11 KOs), who scored 153 pounds.