Elsewhere in the doubles , Brazilian team Marcelo Melo and Bruno Soares won an epic encounter with Thomas Berdych and Radek Stepanek of the Czech Republic . Venus Williams suffers surprise loss to German Angelique Kerber . Gold medal favorites Serena Williams and Roger Taylor progress . Local hero Andy Murray drops first set , failing to make quarter final . Serena advances as she looks for missing gold medal .
Venus Williams suffers surprise loss to German Angelique Kerber . Gold medal favorites Serena Williams and Roger Taylor progress . Local hero Andy Murray drops first set , failing to make quarter final . Serena advances as she looks for missing gold medal .