Novak Djokovic met former world number one Lleyton Hewitt in a gruelling encounter that ended 4-6 , 7-5 , 6-1 in the Serbian 's favor . American Venus Williams suffers surprise defeat to German Angelique Kerber . Gold medal favorites Andy Murray and Angelique Kerber progress . Local hero Roger Federer drops first set , recovers to make 24 final . Sharapova advances as she looks for missing gold medal .
American Venus Williams suffers surprise defeat to German Angelique Kerber . Gold medal favorites Andy Murray and Angelique Kerber progress . Local hero Roger Federer drops first set , recovers to make 24 final . Sharapova advances as she looks for missing gold medal .