BEIJING, China - The second round continues on Tuesday with the current World No.1, a former World No.1 and the Chinese No.1 all in action at the National Tennis Center.
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Tuesday, Second Round
National Tennis Stadium
 Li Na (CHN #8) vs. Nadia Petrova (RUS #14)
Head-to-head: Petrova leads 6-0
Thirty is evidently the new 20 on the WTA; after Serena Williams' trophy-laden summer, last week in Tokyo Nadia Petrova became the latest 30-something to get her hands on some silverware as she rolled back the years to capture the biggest title of her career.
Having received an opening round bye, Petrova's first match in Beijing sees her thrown in at the deep end as she takes on crowd favorite Li Na. Despite her iconic status in China, Li has only been beyond the third round once in seven appearances at her home event and if she is to add to this tally she will need to reverse a six-match losing streak against Petrova.
 Victoria Azarenka (BLR #1) vs. Sabine Lisicki (GER #28)
Head-to-head: Azarenka leads 2-0
Just 96 hours after withdrawing from Tokyo due to mysterious dizzy spells, Victoria Azarenka cast aside any doubts about her health with a quick-fire win over Alizé Cornet on Monday. Next up she faces the unpredictable Sabine Lisicki, who booked her spot with a hard-fought victory over Anabel Medina Garrigues.
This three set win put an end to a three-match losing streak, but despite this iffy form, Azarenka will be well aware of the danger Lisicki can pose. With nine Top 10 wins, Lisicki often saves her best tennis for the big occasion and if her big forehand and even bigger serve begin to find their range, she is more than capable of making life very uncomfortable for the World No.1.
 Caroline Wozniacki (DEN #11) vs. Hsieh Su-Wei (TPE #38)
Head-to-head: Wozniacki leads 1-0
In recent weeks, Caroline Wozniacki has gone about proving true the old adage that form is temporary and class is permanent, ending a 13-month title drought in Seoul before backing it up with an encouraging run in Tokyo. Her next opponent, Hsieh Su-Wei, also arrives in the Chinese capital in a rich vein of form, having won two tournaments - Guangzhou and an ITF event in Ningbo - last month and on Monday rose to a career-best ranking of No.38.
The unorthodox mix of spins, speeds and angles offered up by Hsieh is sure to keep Wozniacki on her toes and provide a good test of just where the former World No.1's form is at. The pair's only previous meeting came four years ago, with Wozniacki winning in two one-sided sets.
Around the grounds?
No.8 seed Samantha Stosur takes on big-serving Julia Goerges on Lotus Court, while the outside courts will play host to Angelique Kerber and Marion Bartoli's matches with qualifiers Lara Arruabarrena-Vecino and Ayumi Morita.
For more on today's matches, see our Match Notes in the Press Center.