Rafael Nadal knocked out by Australian teenager Nick Krygios . The world number one was forced to retire in the second round of Wimbledon after being beaten 7-6 6-4 6-3 by his fellow Spaniard who is ranked a lowly 149th in the world. Roger Federer to face compatriot Stanislas Wawrinka . Serena Williams retires from doubles with viral illness .
Rafael Nadal knocked out by Australian teenager Nick Krygios . Maria Sharapova beaten in three sets by Angelique Kerber . Roger Federer to face compatriot Stanislas Wawrinka . Serena Williams retires from doubles with viral illness .