 Kunze kwepurogiramu yokuvandudza yeU.S., Mercier akatumidzwa kunzvimbo yeUnited States nokuda kwe2005U18 World Championships. Kure nomutambi ane unyanzvi zvikuru, akarumbidzwa nokuda kwokushivirira kwake nokushanda asingazorori sezvaainyora 1 kubatsira mumitambo 6 achibatsira U.S. kubata Gold. Mumutambo wemenduru yegoridhe, kukunda 51 pamusoro peCanada, Mercier akawana mukurumbira paakaongororwa chirango chemutambo uye akadzingwa muchikamu chechitatu zvichitevera kurova kune njodzi pamwe nemabhodhi kurwisa Colton Yellow Horn. 