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No. 1 -- Victoria Azarenka
Last Year: Quarters, L to Na Li 5-7, 2-6
2012 record: 35-3
2012 clay record: 9-2
2012 highlights: Won Australian Open, Indian Wells, Doha, Sydney
First-round opponent: Alberta Brianti
Highest possible quarterfinal seed: Samantha Stosur
(Getty Images)No. 2 -- Maria Sharapova
Last Year: Semis, L to Na Li 4-6, 5-7
2012 record: 29-5
2012 clay record: 12-1
2012 highlights: Finalist at Australian Open, won Stuttgart and Rome
First-round opponent: Alexandra Cadantu
Highest possible quarterfinal seed: Serena Williams
Agnieszka Radwanska backhand shotNo. 3 -- Agnieszka Radwanska
Last Year: Round of 16, L to Maria Sharapova 6-7(4), 5-7
2012 record: 32-7
2012 clay record: 6-3
2012 highlights: Won Miami, Dubai
First-round opponent: Bojana Jovanovski
Highest possible quarterfinal seed: Marion Bartoli
(Getty Images)No. 4 -- Petra Kvitova
Last Year: Round of 16, L to Na Li 6-2, 1-6, 3-6
2012 record: 17-7
2012 clay record: 5-3
2012 highlights: Semi Finalist at Australian Open
First-round opponent: Ashleigh Barty
Highest possible quarterfinal seed: Li Na
(Getty Images)No. 5 -- Serena Williams
Last Year: DNP
2012 record: 27-2
2012 clay record: 15-0
2012 highlights: Won Madrid and Charleston
First-round opponent: Virginie Razzano
Highest possible quarterfinal seed: Maria Sharapova
(Getty Images)No. 6 -- Samantha Stosur
Last Year: Round of 32, L to Gisela Dulko 4-6, 6-1, 3-6
2012 record: 22-11
2012 clay record: 9-4
2012 highlights: Finalist at Doha
First-round opponent: Elena Baltacha
Highest possible quarterfinal seed: Victoria Azarenka
Li Na with 2011 French Open TrophyNo. 7 -- Li Na
Last Year: Champion, W over Francesca Schiavone 6-4, 7-6(0)
2012 record: 21-8
2012 clay record: 9-3
2012 highlights: Finalist at Sydney and Rome
First-round opponent: Sorana Cirstea
Highest possible quarterfinal seed: Petra Kvitova
(Getty Images)No. 8 -- Marion Bartoli
Last Year: Semis, L to Francesca Schiavone 3-6, 3-6
2012 record: 19-11
2012 clay record: 2-4
2012 highlights: Finalist at Paris
First-round opponent: Qualifier
Highest possible quarterfinal seed: Agnieszka Radwanska
Caroline Wozniacki forehand blue courtNo. 9 -- Caroline Wozniacki
Last Year: Round of 32, L to Daniela Hantuchova 1-6, 3-6
2012 record: 20-10
2012 clay record: 3-3
2012 highlights: Finalist at Copenhagen
First-round opponent: Eleni Daniilidou
(Getty Images)No. 10 -- Angelique Kerber
Last Year: Round of 128, L to Edina Gallovits-Hall 6-2, 3-6, 1-6
2012 record: 32-10
2012 clay record: 8-3
2012 highlights: Won Paris and Copenhagen
First-round opponent: Qualifier
(Getty Images)No. 11 -- Vera Zvonareva
Last Year: Round of 16, L to Anastasia Pavlyuchenkova 6-7(4), 6-2, 2-6
2012 record: 7-7
2012 clay record: 2-2
2012 highlights: Quarter Finalist at Charleston and Pattaya City
First-round opponent: Timea Babos
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No. 12 -- Sabine Lisicki
Last Year: Round of 64, L to Vera Zvonareva 6-4, 5-7, 5-7
2012 record: 10-10
2012 clay record: 2-2
2012 highlights: Round of 16 at Australian Open
First-round opponent: Bethanie Mattek-Sands
(Getty Images)No. 13 -- Ana Ivanovic
Last Year: Round of 128, L to Johanna Larsson 6-7(3), 6-0, 2-6
2012 record: 18-11
2012 clay record: 4-3
2012 highlights: Semi Finalist at Indian Wells
First-round opponent: Qualifier
(Getty Images)No. 14 -- Francesca Schiavone
Last Year: Finals, L to Na Li 4-6, 6-7(0)
2012 record: 8-14
2012 clay record: 1-4
2012 highlights: Semi Finalist at Brisbane
First-round opponent: Kimiko Dae-Krumm
(Getty Images)No. 15 -- Dominika Cibulkova
Last Year: Round of 128, L to Vania King 7-6(10), 3-6, 2-6
2012 record: 14-3
2012 clay record: 7-4
2012 highlights: Finalist at Barcelona
First-round opponent: Kristina Mladenovic
(Getty Images)No. 16 -- Maria Kirilenko
Last Year: Round of 16, L to Andrea Petkovic 2-6, 6-2, 4-6
2012 record: 16-10
2012 clay record: 2-3
2012 highlights: Finalist at Pattaya City
First-round opponent: Victoria Larriere