Manuel Alejandro Siaca (born November 21, 1975) is a Puerto Rican boxer at super middleweight.
He turned pro in 1997 and challenged Bruno Girard in 2000 for the WBA Super Middleweight Title, but lost a split decision.
In 2004 Siaca was able to capture a belt, winning the WBA Super Middleweight Title in an upset split decision victory over Anthony Mundine.
[1] He lost the title in his first defense to Mikkel Kessler, after Siaca remained in his corner after round 7.
[2] In 2006 he moved up in weight and battled Silvio Branco for the interim WBA Light Heavyweight Title, but lost the decision.