"I played a great match the other day against Jarmila but I just wasn't able to produce much of it today, " Keothavong said.

BBC: Anne Keothavong

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

The Belgian struggled to defeat Slovak Jarmila Gajdosova on Wednesday, but was far more impressive in dismissing 14th seed Julia Goerges 6-2 7-5 on Thursday.

CNN: Serena returns with victory in Miami

Former Wimbledon champion Kvitova beat 168th-ranked Jarmila Gajdosova 7-6 (7-2) 6-3, then world No. 18 Safarova upset No. 9 Samantha Stosur 7-6 (8-6) 7-6 (7-4).

CNN: Rafael Nadal overcoming his 'bad feeling'

Russian seeds Svetlana Kuznetsova, Anastasia Pavlyuchenkova and Maria Kirilenko also went through, with the latter to face Canada's Aleksandra Wozniak after eliminating Australia's Jarmila Gajdosova.

CNN: STORY HIGHLIGHTS

In the earlier mixed doubles final Sunday, wild-card entrants Jarmila Gajdosova and Matthew Ebden of Australia beat the Czech pair of Lucie Hradecka and Frantisek Cermak 6-3, 7-5.

NPR: Djokovic Beats Murray For 3rd Straight Aust. Title

Poland's Urszula Radwanska beat Tamira Paszek of Austria 2-6 6-0 6-2, while home hope Jarmila Gajdosova shocked world number 16 Roberta Vinci of Italy 4-6 6-1 6-3 to set up a clash with second seed Sharapova.

CNN: STORY HIGHLIGHTS

To add to a successful night for Belarusian cycling, Tatsiana Sharakova (30 points) won the women's points race, another non-Olympic event, while Jarmila Machacova of Czech Republic (20 points) took silver and Giorgia Bronzini of Italy (14 points) collected bronze.

BBC: Track Worlds 2011: GB open with double world bronze