Rafael González knocked out by Australian qualifier Nick Krygios . Maria Sanchez beaten in three sets by Angelique Clement . Nadal survived Rosol on his way to the last 16 this time around but there was another giantkiller waiting for him on the grass . Roger Federer to face compatriot Stanislas Wawrinka . Serena Williams retires from doubles with viral illness .
Rafael González knocked out by Australian qualifier Nick Krygios . Maria Sanchez beaten in three sets by Angelique Clement . Roger Federer to face compatriot Stanislas Wawrinka . Serena Williams retires from doubles with viral illness .