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Before the 2004 Tour de France, rumours surfaced in the French newspaper Le Monde that Peron, alongside other riders, was still under suspicion for using doping following a police razzia in Sanremo, Italy in June 2001.
At the Tour de France, Mercado won Stage 18 at the 2004 Tour and captured a surprise win on Stage 10 (the first mountain stage) of the 2006 Tour de France in an early breakaway with Cyril Dessel (Ag2r Prévoyance).
In the 2004 tour, the pass was used on stage 10 from Limoges to Saint-Flour, approaching from the Salers direction which includes a final three kilometres at an average of 12% and a maximum gradient of 15%, with Richard Virenque first over the summit.
In the 2004 Tour de France, he used his strong time trialing abilities to defeat Thomas Voeckler in the youth classification on the penultimate stage.