the baltimore orioles selected gamboa in the 21st round of the 2008 mlb draft. they added gamboa to their 40-man roster on november 20, 2013. but non-tendered him on december 2, making him a free agent. gamboa was handed a 50-game suspension for testing positive for "exogenous testosterone," a performance-enhancing substance in violation of the minor league drug prevention and treatment program on june 13, 2014.