Jankovic will face Belarus qualifier Anastasiya Yakimova, who rallied to defeat Masa Zec Peskaric of Slovenia 3-6, 6-2, 6-3.
Stefanie Voegele upset second-seeded Petra Kvitova of the Czech Republic 7-5, 6-2. The Swiss next plays Tamira Paszek of Austria, who won the tournament on her only previous appearance here in 2006 but is a wild card this year.
Story continues below ↓advertisement | your ad hereEighth-seeded Sofia Arvidsson was also beaten in an upset, losing 7-6 (1), 6-2 to Johanna Larsson in an all-Swedish match. While Ksenia Pervak of Russia knocked out fifith-seeded Dominika Cibulkova of Slovakia 6-1, 6-3.
Anastasia Pavlyuchenkova of Russia, Sara Errani of Italy and Polona Hercog of Slovenia all advanced to the second round.
Pavlyuchenkova defeated Alberta Brianti of Italy 7-5, 6-1, Errani downed Anna Tatishvili of Georgia 7-6 (1), 6-4 and Hercog beat Russian qualifier Elena Bovina 6-3, 6-3.
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