World number two Rafael Nadal starts with win at the Australian Open . Reigning champion enjoys third straight victory in the tournament . Former world number two Ana Ivanovic loses to qualifier in Stuttgart . It was Nadal 's 30th straight victory at the event , where he has won six of the last seven titles at the Real Club de Tennis . German Mona Barthel watched Stuttgart win German Open whilst at school .
World number two Rafael Nadal starts with win at the Australian Open . Reigning champion enjoys third straight victory in the tournament . Former world number two Ana Ivanovic loses to qualifier in Stuttgart . German Mona Barthel watched Stuttgart win German Open whilst at school .