Weeks before the start of the 38th PBA season, he was traded to Barako Bull in exchange for Carlo Sharma and 3-point bomber Sunday Salvacion.
Ballesteros played college basketball for the San Sebastian Stags where he became the team's starting center. While playing for San Sebastian, he was known as one of NCAA Philippines' top defensive players, winning the Defensive Player of the Year award twice, in 2007 and 2008. He also made the league's Mythical Five team in his final season in 2008.
Ballesteros played for Smart Gilas, the Philippine national team, and was one of the Smart Gilas' pioneers. Of all the big men from the first Gilas team, he stayed with the team the longest, from its creation in 2008 until 2011, when he was drafted to the PBA.
Ballesteros was drafted by Meralco Bolts seventh overall in the 2011 PBA draft that also featured his former Smart Gilas teammates.
On September 12, 2014, he and Salvacion were sent to Blackwater Elite in a three-way trade involving NLEX Road Warriors and Meralco Bolts. NLEX obtained Blackwater's 2016 and 2017 2nd round pick along with the draft rights for Juneric Baloria. Meralco received Sean Anthony from NLEX via Blackwater as third party.
On March 20, 2016, Ballesteros was traded to Mahindra Enforcer for Kyle Pascual.
