BAD GASTEIN, Austria - Only three seeds remain in the draw at the Nϋrnberger Gastein Ladies following two significant upsets in second round action on Thursday.

Ioana Raluca Olaru upended third-seeded Sybille Bammer, 46 62 61, especially surprising given that the 22nd-ranked Austrian was fresh off her second Sony Ericsson WTA Tour singles title last week in Prague. The victory means Olaru has now matched her best results on Tour this year, quarterfinal showings in Bogotá and Warsaw, both of which were also on clay. Next up for the Romanian is No.6 seed Magdalena Rybarikova, whom she is 0-2 against in her career.

Thursday's other upset saw Andrea Petkovic up on fourth-seeded Iveta Benesova, 6-1, when the Czech retired with a left thigh injury. In her first career Tour quarterfinal, Petkovic will face fellow German and No.7 seed Anna-Lena Groenefeld, whom she defeated in their only previous match-up.

As for top seed Alizé Cornet, she lost the first set just like in her first round match, but rallied to advance, 36 64 61, over Patricia Mayr. Her opponent in Friday's quarterfinals will be Barbora Zahlavova Strycova, who came out on top against Nuria Llagostera Vives, 60 63, after two previous losses to the Spaniard, including in the first round of Indian Wells this year. Cornet, who is into the quarters of an event for the first time since Paris [Indoors] in February, is 2-0 lifetime against Zahlavova Strycova.