Serena Williams goes into the Australian Open a red-hot favourite in her quest for a sixth title with even world number one Victoria Azarenka admitting the American is the player to beat.Williams gets her 13th Melbourne campaign underway Tuesday against Romania’s Edina Gallovits-Hall, fresh from claiming her 47th career title in Brisbane and with a rare calendar-year Grand Slam in her sights. She sits behind defending champion Azarenka and Maria Sharapova in the current world rankings.