Kerber will now meet the defending champion Tamarine Tanasugarn of Thailand in the quarters.
Petra Cetkovska of Czech Republic secured herself the quarterfinal spot by beating the qualifier Eirka Sema of Japan 6-0, 6-3.
Next for Cetkovska will be Zheng Jie of China.
Other 2nd round results:
Tamarine Tanasugarn (THA) – Mathilde Johansson (FRA) – 6-2, 6-4
Zheng Jie (CHN) – Jarmila Gajdosova (AUS) – 7-5, 6-3