Doubles team of Gisela Dulko and Flavia Pennetta will have a chance to defend their WTA Championships title from Doha by becoming the third doubles partnership to qualify for the year-end event, which will take place in Istanbul this year.

Dulko and Pennetta won their first Grand Slam title this year at the Australian Open and recently they played two Premier finals: Tokyo and Beijing. Also, they held the No.1 doubles ranking between them for eight months.

One more team can qualify in doubles, Victoria Azarenka and Maria Kirilenko or Vania King and Yaroslava Shvedova. Kveta Peschke and Katarina Srebotnik and Liezel Huber and Lisa Raymond are already in.

In singles there is also one spot left, which will be taken by either Agnieszka Radwanska or Marion Bartoli. Already qualified are: Caroline Wozniacki, Maria Sharapova, Petra Kvitova, Victoria Azarenka, Li Na, Vera Zvonareva and Samantha Stosur.

Additional info: Pennetta recently at the China Open became only the second woman in history who defeated No.1 players in both singles and doubles on the same day. (photos: Ralf Reinecke)

Last week at the China Open Flavia Pennetta defeated singles and doubles No.1s on the same day – Caroline Wozniacki and Liezel Huber – thus joining the legendary Steffi Graf as the only other player in history to achieve the feat.

In the Friday's Beijing singles quarterfinals, Pennetta upset top-ranked Wozniacki, and then, together with Gisela Dulko, beat the doubles team of Liezel Huber and Lisa Raymond in the semifinals.

Graf defeated the No.1-ranked player in singles and doubles by winning over Martina Navratilova in Berlin, in 1986, when Navratilova was on top of both the singles and doubles rankings.

Moreover, only five players in history managed to beat both the No.1s at the same tournament: Steffi Graf in 1986, Jana Novotna in 1996, Lindsay Davenport in 2008, Venus Williams in 2009, and now Flavia Pennetta. (source: WTA Tour, photo: sr_cranks)

When China Open defending champion Caroline Wozniacki took the first set from Flavia Pennetta 6-3, the Dane looked to be on a good way to progress to the semifinals, but the Italian fired back by bageling Wozniacki in the second set. After just 20 minutes into the decider, Wozniacki found herself trailing 4-1. Later she had her chances and was two points away from victory leading 6-5, but Pennetta won the game and the subsequent tiebreaker.

Pennetta had lost all five of their previous encounters.

The 3-6 6-0 7-6(2) win over the world No.1, who’s occupied the position for a year now, booked Pennetta a clash with No.11 seed Agnieszka Radwanska, whose opponent, Ana Ivanovic, retired.

Ana Ivanovic recorded three solid victories en route to the China Open quarterfinals, against Kimiko Date-Krumm, Svetlana Kuznetsova, and Vera Zvonareva, having lost just ten games to reach the final eight, but a left low back injury sustained in Tokyo last week forced her to retire in the second set against Radwanska and the Pole is through to the semis.

"I have been doing lots of treatments on it, but it hasn't been really getting much better," said Ivanovic about the injury due to which she left the tournament while trailing 6-3 3-2.

Radwanska had a milestone victory last week at the Toray Pan Pacific Open. (photos: sr_cranks)

Dear readers, Florian Meier from OnlineTennisInstruction.com is back to preview the US Open quarterfinals. One of his and actually the world's biggest favorites Maria Sharapova was eliminated early, but Serena Williams is still doing strong. Let's see what Florian's predictions look like now.

US Open quarterfinals preview: Serena still the tournament favorite

We are now at the quarterfinals stage of the tournament and Serena looks almost unbeatable to me at this point (join our poll to vote who has the best chance of shaking Serena's dominance this US Open). Let’s have a closer look at the upcoming quarterfinal match-ups.

CAROLINE WOZNIACKI versus ANDREA PETKOVIC

Wozniacki has had a really good draw so far in this tournament and to me she was not all that convincing in her victory against Svetlana Kuznetsova. I am not sure how strong her form actually is. She was down 4-1 in the second set against Kuznetsova who is also not in her best form at the moment.

Andrea Petkovic looked convincing in her last two matches but she has not faced any really strong players so far in this tournament. Petkovic is also playing with an injured knee but it seems to be holding up fine so far in the tournament. Wozniacki and Petkovic are 1-1 in their career matches. Petkovic won this year on a hard court in Miami and Wozniacki won on an indoor clay court in Stuttgart.
In order to beat Wozniacki you have to be able to get by her with some firepower and be patient enough to work the point a few times. I believe Petkovic has these capabilities. Andrea is fired up like I have never seen her before and I think she is also mentally ready to beat someone like Wozniacki in a Grand Slam quarterfinal.

Assuming that Petkovic’s knee holds up, I pick her as my favorite in a very close match.

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It's over: with zero aces, 12 doubles faults and 60 unforced errors Maria Sharapova, the strongest favorite for the title besides Serena Williams, lost to Flavia Pennetta 6-3 3-6 6-4 in the third round of the 2011 US Open.

The Russian said she hadn’t felt comfortable with most of her game and she lost a three-setter the first time this year (she had a 12-0 record in 2011 when the deciding set had to be played). After being down 3-0 and 4-1 in the final set, Sharapova managed to get the score to 4-all, 15-30 on Pennetta’s serve. Then the downward spiral started for the Russian and the 26th-seeded Pennetta won all the remaining seven points to earn one of the biggest victories of her career in two and a half hours.

Of course, the 2006 US Open champion Sharapova didn’t accept the defeat lightly:

It's disappointing to lose in New York. Losing isn't fun for anyone because we work to win. We don't work to try to lose. So when we're faced with a position where we can win and we didn't in the end, it's tough.

(photo: sr_cranks)