ISTANBUL, Turkey - In the year-long build-up to the TEB BNP Paribas WTA Championships - Istanbul 2012, it has been about winning matches and building up ranking points. But now that the elite eight line-up is set, it's all about match-ups, match-ups and more match-ups. Some players have done amazing things against the rest of the elite eight, while some have struggled.

Who has done well against the rest and who hasn't? Check it out...

Qualifier No.1: Victoria Azarenka
~ Azarenka vs. rest of elite eight in 2012: 14-5
~ Azarenka vs. rest of elite eight in career: 31-26

Qualifier No.2: Maria Sharapova
~ Sharapova vs. rest of elite eight in 2012: 11-8
~ Sharapova vs. rest of elite eight in career: 29-25

Qualifier No.3: Serena Williams
~ Williams vs. rest of elite eight in 2012: 9-1
~ Williams vs. rest of elite eight in career: 35-5

Qualifier No.4: Agnieszka Radwanska
~ Radwanska vs. rest of elite eight in 2012: 5-10
~ Radwanska vs. rest of elite eight in career: 17-32

Qualifier No.5: Angelique Kerber
~ Kerber vs. rest of elite eight in 2012: 6-12
~ Kerber vs. rest of elite eight in career: 8-18

Qualifier No.6: Petra Kvitova
~ Kvitova vs. rest of elite eight in 2012: 5-7
~ Kvitova vs. rest of elite eight in career: 15-13

Qualifier No.7: Sara Errani
~ Errani vs. rest of elite eight in 2012: 2-8
~ Errani vs. rest of elite eight in career: 4-23

Qualifier No.8: Li Na
~ Li vs. rest of elite eight in 2012: 7-8
~ Li vs. rest of elite eight in career: 26-23

Breaking Down Serena's Dominance
Serena Williams' 9-1 record this year against the rest of the elite eight has certainly helped at the business end of tournaments this year: she has won six very big WTA titles, including two Grand Slams and the Olympics.

But it's not like she only lifts her game against the best - she has barely lost any matches lately, winning 43 of 45 matches since the start of April (the only losses coming to Virginie Razzano at the French and Kerber at Cincy).

Here's Williams' head-to-heads against the rest of the elite eight:
Williams 10-1 vs. Azarenka (4-0 this year)
Williams 9-2 vs. Sharapova (2-0 this year)
Williams 3-0 vs. Radwanska (1-0 this year)
Williams 1-1 vs. Kerber (0-1 this year)
Williams 3-0 vs. Kvitova (1-0 this year)
Williams 4-0 vs. Errani (1-0 this year)
Williams 5-1 vs. Li (0-0 this year)

Watch this space and www.wtachampionships.com for all the best coverage from the TEB BNP Paribas WTA Championships - Istanbul 2012!