World number six Petra Kvitova is through to the Australian Open quarter-finals after a commanding victory over American teenager Amanda Anisimova.
Kvitova broke twice in the first set and three times in the second to win 6-2 6-1 in a flawless performance.
The Czech two-time Grand Slam champion has reached the last eight on two other occasions but has never won the title in Melbourne.
She will face Australian Ashleigh Barty or Russian Maria Sharapova next.
More to follow.