He had an amateur record of 105-5: Known as "Fast Fres" and "The Big O", Oquendo won his first 22 professional bouts, including impressive victories over Duncan Dokiwari, Bert Cooper, Clifford Etienne, David Izon, and Obed Sullivan.
[1] In 2003, Oquendo came from behind to KO Maurice Harris in the 10th, setting up a shot at IBF heavyweight title holder Chris Byrd.
In 2004, Oquendo got another shot at a belt against WBA heavyweight title holder John Ruiz, losing by TKO in round 11.
He again gained the WBC-WBO Latino belt in 2007, after defeating Dominique Alexander then following it up with a win against Cuban Elisier Castillo.
Oquendo fought Bruce Seldon on July 24, 2009, in a Regional Title bout which was officiated by fellow Carl Schurz High School Graduate, Alma Mater, World Class referee Pete Podgorski.
In 2010 Oquendo became only the 2nd man in 35 Pro fights to stop Demetrice King and gain the USBA & NABA titles.
He then fought former champion Jean-Marc Mormeck and lost in a fight that Dan Rafael called candidate for "robbery of the year".
In 2012, Oquendo made his return to the ring with a 2nd round DQ, (originally scored a TKO) against World Record holder Travis Fulton.
Oquendo fought June 8, 2013 to defend his WBA Fedelatin and also fight for the NABA and WBC US Silver belt.
[2] On July 6, 2014, Oquendo fought former champion Ruslan Chagaev, for the vacant WBA world heavyweight title.