No.2 seed and defending champion Angelique got her quest for a second Sydney International title off to the perfect start with a straight sets win over world no.27 Camila Giorgi.
Angie recorded a 7-6 (3), 6-2 victory and sixth triumph in as many meetings with the Italian.
The two had traded break once in the first set before the German clinched the tie-break.
Angelique kept the momentum going into the second set, and sealed the win in one hour and 47 minutes.
Stats: aces (0-3), double faults (4-6), total points won (77-62).
In the last eight, Angie faces either fifth seed and 2005 winner Petra Kvitova or Su-Wei Hsieh.