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College career De Ocampo started playing organized basketball at the Saint Francis of Assisi College System Doves together with his brother, Yancy. The De Ocampo brothers led the varsity squad to several NCRAA titles. Upon the exit of the older De Ocampo, the Doves became Ranidel's team. Thus, he led the squad into several statistical categories such as in scoring and rebounding. He won four NCRAA MVP plums along with the legacy as arguably the finest player in the history of the NCRAA. Professional career In 2004, after a celebrated collegiate career at St. Francis, De Ocampo decided to turn pro and enter the PBA draft. He was selected by the FedEx Express as the fourth overall pick, having selected ahead of higher profile players such as classy UE point guard Paul Artadi, multi-titled PBL veteran Gary David and former Ateneo Blue Eagles star Wesley Gonzales. During his rookie year, he played alongside his brother Yancy. He played in a total of 59 games and averaged decent rookie numbers of 7.5 points and 4.6 rebounds while playing a little over 21 minutes of action per game. After a so-so performance in his first year, he made an impact in the 2005–06 season by improving his rookie numbers of 7.5 points per game to 13.3 in his sophomore year in 37 of 51 games played. He also registered 6.7 rebounds and 2.4 assists in that year. In 2008, de Ocampo was again included in the RP Training Pool, his second stint, assembled by the PBA under Coach Yeng Guiao. In the middle of the 2008–09 PBA Philippine Cup, he was traded to the Talk 'N Text Tropang Texters for veteran Don Allado. His all-around play helped them beat the Alaska Aces in that conference's finals series, 4-3, earning him his first PBA title. De Ocampo (#9) at the 2014 FIBA Basketball World Cup In 2015, de Ocampo led the Texters to the 2015 PBA Commissioner's Cup championship, winning a seven-game series against Rain or Shine Elasto Painters. On April 29, 2015, de Ocampo was named as the Finals MVP. During the series, he averaged 24.3 points and 6.6 rebounds and as well as shooting at an impressive 40% from the three-point area over the course of seven games. International career He was included in the Gilas Pilipinas roster that placed second in the 2013 FIBA Asia Championship held in Manila and earned a ticket to compete in the 2014 FIBA Basketball World Cup. De Ocampo also buried a crucial three point field goal late in the fourth quarter which secured Gilas a slot in the 2014 World Cup. In July 2016, de Ocampo announced his retirement from international basketball following the Gilas' loss to the New Zealand men's national basketball team that ended their bid to qualify for the 2016 Summer Olympics.