Serena Williams and Novak Djokovic seal commanding wins at Australian Open . World No . 1 But before Australian tennis fans get their hopes up , Hewitt made it clear he was only joking . Andy Murray beats Roger Federer in straight sets to win his first Grand Slam title since Wimbledon last year. A record-equaling nine players have withdrawn or retired from their first round matches . Temperatures in Melbourne have lingered above 40 degrees Celsius .
Serena Williams and Novak Djokovic seal commanding wins at Australian Open . World No . 1 Andy Murray beats Roger Federer in straight sets to win his first Grand Slam title since Wimbledon last year. A record-equaling nine players have withdrawn or retired from their first round matches . Temperatures in Melbourne have lingered above 40 degrees Celsius .