article_snippet: I have to be that little bit better,’ said Rosberg, who won six fewer races than his team-mate last season. 
article_snippet: ‘Last year wasn’t quite enough and I just need to try to look for a little bit extra.
article_snippet: I have focussed on pushing myself even harder for the rematch with Lewis,'he added. '
highlights_snippet: CLICK HERE for all the latest Australian Grand Prix 2015 build-up .