World No . 1 playing in first match since winning Wimbledon . Djokovic 's three - set win sets up tie with Jo - Wilfried Tsonga . Serena Williams through to third round at the event in Miami . But he is still wary of the threat posed by the 13th seed . Defending champion a straight - sets winner over Samantha Stosur .
World No . 1 playing in first match since winning Wimbledon . Djokovic 's three - set win sets up tie with Jo - Wilfried Tsonga . Serena Williams through to third round at the event in Miami . Defending champion a straight - sets winner over Samantha Stosur .