From Barry Hugman's History of World Championship Boxing
2007-04-28 Ivan Calderon w pts 12 Ronald Barrera, North University Coliseum, Barranquilla, Colombia - WBO. Referee: Luis Pabon. Scorecards: 115-113, 115-113, 113-115.
After Calderon handed in his belt on beating Hugo Fidel Cazares for the WBO junior flyweight title on 25 August, the WBO signed up Donnie Nietes and Pornsawan Porpramook to contest the vacant title.