Laid low by sore knee, Wawrinka shown door by energetic Russian

The Swiss three-time grand slam champion was out-gunned by 21-year-old Medvedev, who had the Centre Court crowd on their feet as he pulled off a dazzling array of winners to wrap up a 6-4, 3-6, 6-4, 6-1 victory on his first Wimbledon appearance.