Kim Clijsters beat Russian Svetlana Kuznetsova 7-5, 6-2 to win the Warsaw Cup
Elena Likhovtseva and Nadia Petrova also made it to the last four.
Justine Henin-Hardenne battled her way to a 6-7, 6-4, 6-3 victory over Russia's Nadia Petrova to leave the countries level at 1-1 in Fed Cup
Carlos Moya won the 'battle of Mallorca', beating Rafael Nadal 2-6, 6-1, 6-1 in the second round
The Russian ace was beaten by Nicole Vaidisova in the Family Circle Cup second round.
French Open champion Anastasia Myskina lost to 15-year-old Czech Nicole Vaidisova in the second round of the Family Circle Cup.
The third seed best her fellow Russian 6-1, 6-2 to win her first Pacific Life Open.
Dementieva will face third seed Maria Sharapova, who beat Martina Hingis, in the final of the Pacific Life Open.
The Belgian will face Elena Dementieva while the Swiss ace will take on Paradorn Srichaphan in ther semi-finals of the Pacific Life Open.
World number one Justine Henin-Hardenne will not play in next week's $3 million NASDAQ-100 Open, preferring instead to hone her claycourt game.
World number one Justine Henin struggled to a 3-6, 6-3, 7-5 win over Czech teenager Nicole Vaidisova to earn a meeting with 19-year-old Frenchwoman Tatiana Golovin, who ousted Italy's Francesca Schiavone 6-0, 6-4.
Justine Henin will face Frenchwoman Tatiana Golovin in the final of the Zurich Open.
It was the fourth-seeded Belgian's third Dubai and 25th career title.
The world number one who won the Dubai Open on Saturday is hot favourite to complete a Gulf double at the Qatar Open.
The third seed won her first Grand Slam title when the Belgian retired from the women's singles final because of injury.
Eighth seed Justine Henin-Hardenne fought back from a set down to topple the top seed and reach the semi-finals of the Australian Open.
A shoulder injury forced her to withdraw from a semi-final with Justine Henin-Hardenne.
Wimbledon champion Venus Williams was pushed to the limit before beating third seed Jelena Jankovic of Serbia 4-6 6-1 7-6 on Wednesday to reach the US Open semi-finals.
Unlike previous years when there seemed to be only a small handful of genuine contenders, there are as many as a dozen women vying for the crown this season.
Williams's last Grand Slam victory came 18 months ago at Wimbledon, and her form and fitness since returning to the tour after an eight-month layoff have been inconsistent.
The defending champion withdrew from this year's Grand Slam tournament because of a knee injury.
The world number 19 said her victory was reward for her father Walter.
Mary Pierce beat unseeded Italian Francesca Schiavone 6-4, 6-3 in the Kremlin Cup final to win her second title in Moscow
Justine Henin opened the defence of her French Open crown with a battling 6-4, 6-3 win over 20-year-old Russian Elena Vesnina on Sunday.
The Belgian ace made the semi-finals of the Acura Classic along with Justine Henin-Hardenne and Lindsay Davenport.
Defending champion Nadia Petrova was also shown the door in the quarter-finals of the German Open.
Kim Clijsters captured the Rogers Cup with a 7-5, 6-1 victory over fellow Belgian Justine Henin-Hardenne.
Henin-Hardenne has not played since the French Open in May, having been sidelined by a viral infection.