A breakdown of the withdrawals, retirements, and medical timeouts happening in the ninth and 10th weeks of the 2017 WTA season.
WTA Staff

BNP Paribas Open

Pre-Tournament Withdrawals

Serena Williams (left knee)
Petra Kvitova (left hand)
Victoria Azarenka (birth)
Sloane Stephens (left foot)
Anna-Lena Friedsam (right shoulder)
Karin Knapp (right knee)
Kristina Kucova (left knee)
Alizé Cornet (right shoulder)

Retirements

Vania King (left ankle) - 1R vs. Andrea Petkovic, 6-2, 2-0

Timea Bacsinszky (left wrist) - 4R vs. Karolina Pliskova, 5-1

Medical Timeouts

Yanina Wickmayer (left wrist) - 1R, d. Laura Siegemund, 6-3, 3-6, 6-4

Raquel Atawo (right thumb) - 1R doubles with Xu, l. Hingis/Chan, 6-1, 6-4

Jelena Ostapenko (non-treatable) - 1R, d. Danka Kovinic, 6-4, 2-6, 7-6(3)

Irina Falconi (fourth, fifth toe blisters) - 1R, l. Jelena Jankovic, 6-2, 3-6, 6-3

Yaroslava Shvedova (right ankle) - 1R, l. Varvara Lepchenko, 4-6, 6-4, 6-2

Kirsten Flipkens (right lower back) - 2R, l. Garbiñe Muguruza, 6-2, 6-3

G. Muguruza (right toe) - 2R, d. Flipkens

Annika Beck (lower back) - 2R, l. Kristina Mladenovic, 6-0, 7-5

Kiki Bertens (right elbow) - 3R, l. Timea Bacsinszky, 6-3, 5-7, 7-6(8)

Kristina Mladenovic (eye irritation) - 3R, d. Simona Halep, 6-3, 6-3

Elena Vesnina (dizziness) - 3R, d. Timea Babos, 6-4, 1-6, 6-4

Katerina Siniakova (right neck) - 3R, l. Caroline Wozniacki, 6-3, 6-1

Dominika Cibulkova (left hip) - 4R, l. Anastasia Pavlyuchenkova, 6-4, 3-6, 6-2

Caroline Wozniacki (right ankle) - 4R, d. Madison Keys, 6-4, 6-4

C. Wozniacki (right ankle) - QF, l. Kristina Mladenovic, 3-6, 7-6(4), 6-2

Lucie Safarova (left eye) - doubles SF with Mattek-Sands, l. Hingis/Chan, 7-6(7), 7-5

Lucie Hradecka (right wrist) - doubles final with Siniakova, l. Hingis/Chan, 7-6(4), 6-2