Mercedes have warned triple Formula One world champion Lewis Hamilton and team mate Nico Rosberg to steer clear of controversy in the Mexican Grand Prix.
Jenson Button faces a record but meaningless 70 place grid penalty at the Mexican Formula One Grand Prix after problems with his McLaren's Honda power unit.
Nico Rosberg set the fastest time for Mercedes in Mexican Grand Prix practice as large crowds welcomed Formula One back to Mexico after a 23-year absence.