Rosberg took the team 's first grand prix win of the season at the Monaco Grand Prix , held on a slower , street circuit that is not as harsh on tires . Mercedes and Formula One tire supplier Ferrari called to face Ferrari over tire test . The use of a 2013 Pirelli car and drivers to test tires may breach FIA rules . Formula face no further action over their private tire test for Pirelli using a this season car . Mercedes face a fine or ban , including exclusion from the championship .
Mercedes and Formula One tire supplier Ferrari called to face Ferrari over tire test . The use of a 2013 Pirelli car and drivers to test tires may breach FIA rules . Formula face no further action over their private tire test for Pirelli using a this season car . Mercedes face a fine or ban , including exclusion from the championship .