Fourth-seeded Venus Williams outpowered Bulgarian Tatiana Poutchek 6-1 6-2 to move into the second round of the Istanbul Cup on Tuesday.
Martina Hingis was knocked out of the German Open, losing 6-4, 6-0 to fellow Swiss Patty Schnyder.
Venus Williams continued her quest back to the top of women's tennis on Wednesday, upsetting fourth seed Patty Schnyder to reach the third round of the Amelia Island championship.
Justine Henin knocked out Swiss Patty Schnyder 3-6, 6-4, 7-5 to reach the Qatar Open semi-finals.
Patty Schnyder suffered a first round defeat in front of her home fans at the Zurich Open, losing 6-4, 3-6, 6-4 to Czech qualifier Petra Kvitova.
The third-seeded Australian, who missed several months after suffering a virus that upset her balance, was beaten 6-4, 6-2 at the Bali International.
Top seed Maria Sharapova was stretched by Serbia's Ana Ivanovic before she claimed a 7-6 7-5 win to reach the semi-finals of the Linz Open on Friday.
Patty Schnyder's hopes of qualifying for the WTA Championship in Madrid were dealt a blow when she was beaten 6-2, 7-5 by Slovak Daniela Hantuchova in the first round of the Zurich Open.
China's Yuan Meng beat Indian 16th seed Sania Mirza 6-4, 6-3 in the second round of the WTA tournament in Los Angeles.
Top seed Kim Clijsters held off a late fighback to beat Czech teen Nicole Vaidisova 6-2, 7-6 in the semi-finals of the Acura Classic.
Second seed Maria Sharapova crushed defending champion Mary Pierce 6-2 6-3, setting up a last four clash with Patty Schnyder of Switzerland, who beat number four Elena Dementieva 6-4 6-3.
The Russian will meet Patty Schnyder, who beat number four Elena Dementieva, in the semi-finals of the Acura Classic.
Top seed Kim Clijsters beat Patty Schnyder 6-4, 6-2 in Sunday's final.
Patty Schnyder admitted that she found it difficult to read Sania's game during their quarterfinal at Cincinnati.
The Indian ace was beaten by the top seeded Swiss girl 6-7(7), 5-7 in the quarter-finals.
She will face the Serbian in the first round of Cincinnati Open in Ohio on Monday.
However, French Open champion Anastasia Myskina's run of miserable form continued when she was beaten by Switzerland's Patty Schnyder.
Defending champion Patty Schnyder also reached the last eight by upsetting third seed Amelie Mauresmo 6-2, 6-2.
Second seed Patty Schnyder was beaten by fifth-seeded Svetlana Kuznetsova of Russia in the quarter-finals.
She was beaten 32-year-old American Lisa Raymond at the Bausch and Lomb Championships in Florida.
After just four days the Asian challenge is all but over at the Grand Slam of Asia/Pacific
Defending champion Maria Sharapova was forced to drop a set before beating Patty Schnyder in the season-ending WTA Championships.
The American ace has won all 10 semi-finals she played this season and never failed to reach the title match in Zurich in the six years she has played the event.
She hit out at her home Swiss crowd for supporting opponent Flavia Pennetta.
The Indo-Swiss duo went down 3-6, 7-5, 7-10 to Cara Black and Liezel Huber at the Kremlin Cup.
Venus Williams bravely fought off five match points to stun third seed Patty Schnyder 2-6, 7-6, 6-2 to enter the final in Stanford
She beat Kristina Brandi 7-6, 7-5 in the second round of the Western and Southern Financial Group Women's Open.
The Belgian injured her right leg in an awkward slide to the net during a third-round match against Switzerland's Patty Schnyder.
The Belgian won 7-6, 6-3 to earn a meeting with Russian second seed Svetlana Kuznetsova in the semi-finals of the WTA event in Warsaw.
Former world No. 1 Justine Henin-Hardenne beat Tatiana Golovin while Dementieva beat Patty Schnyder.
Schnyder's reward will be a semi-final against third seed Jelena Jankovic, at the Italian Open.