"Today is a very difficult day for me. I am very confused because I am always the one promoting fair play and healthy effort. I don't understand what could have happened," Fiol wrote on his Facebook profile after apologizing.

The tests performed on Fiol detected the presence of stanozolol in his body from a sample taken on July 12, according to the notification received from the Anti-Doping Agency, the Pan American Sports Organization (Odepa).

This first doping case, which will cost the Peruvian his silver medal in the 200-meter butterfly yesterday, adds to the other two that were discovered before the start of the competition, those of weightlifters Cinthya Domínguez (Mexico) and Astrid Camposeco (Guatemala), who have not participated.