Blanco competed only in the men's 50 m freestyle at the 2000 Summer Olympics in Sydney. He achieved a FINA B-standard entry time of 23.87 from the Central American and Mexican Championships in his hometown San José. Swimming in heat three, Blanco powered past the entire field to a top seed in a new Costa Rican record of 23.72. Blanco's blistering triumph was not enough to put him through to the semifinals, as he placed forty-fifth overall out of 80 swimmers in the prelims.