
Carlos Alcaraz sent a chilling warning to his Australian Open rivals on Saturday, outclassing Shang Juncheng before the Chinese teenager was forced to retire as Iga Swiatek aims for her 19th straight win.
A day after defending champion Novak Djokovic returned to top form, world number two Alcaraz laid down a marker in a lopsided third-round contest lasting just 66 minutes.