Three-time Professional Bull Riding tour champion Adriano Moraes falls off Mataska during the PBR's Des Moines Classic, in Des Moines, Iowa, on May 3. Moraes, 38, announced in January that this will be his last season in the PBR. The charismatic, Brazilian-born Moraes acknowledges the decision to retire from the sport that has defined him was a tough one.