Order of play at the Australian Open on Tuesday, day nine of the first Grand Slam of the year at Melbourne Park (x denotes seed): Rod Laver Arena 12:30 pm (0130 GMT) Hsieh Su-wei (TPE) v Naomi Osaka (JPN x3) Not before 3:00 pm (0400 GMT) Grigor Dimitrov (BUL x18) v Aslan Karatsev (RUS) 7:00 pm (0800 GMT) Serena Williams (USA x10) v Simona Halep (ROM x2) Novak Djokovic (SRB x1) v Alexander Zverev (GER x6) afp