Maria Kirilenko and Jarmila Gajdosova (who went back to her maiden name last month after separating from husband Sam Groth) could surprise.

基里连科和加多索娃（格罗斯，上个月与其前夫离婚后改回其婚前姓）可能爆冷。

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"One of the stand-out elements of Park City is the number of terrific comedies at the festival, " Groth told the BBC News website.

BBC: Sundance London film festival announces 2013 line-up

In South Africa, Britain's Elena Baltacha lost 2-6 7-6 6-4 to Jarmila Groth in the quarter-finals of the International Tennis Federation event in Johannesburg.

BBC: Caroline Wozniacki beats Patty Schnyder in Charleston

Keothavong had managed a confidence-boosting three set win over world number 41 Jarmila Groth the day before, but couldn't repeat her efforts on Wednesday.

BBC: Anne Keothavong