Aryna Sabalenka underlined why she had long been considered the Australian Open favourite by overpowering Zheng Qinwen to retain the women's title.
Belarusian second seed Sabalenka won 6-3 6-2 to claim her second Grand Slam singles trophy without dropping a set.
With 12th seed Zheng backed by fanatical Chinese support, a composed Sabalenka sucked the energy out of her opponent and the crowd in a fast start.
She is the first woman to win back-to-back since Victoria Azarenka in 2013.
Sabalenka, 25, who became the strong favourite after top seed Iga Swiatek was beaten in the third round, emulated her compatriot Azarenka with a victory that took little over an hour.