No.4 seed and Wimbledon quarterfinalist Zhang Shuai is the only previous champion remaining in the draw, having lifted the trophy in 2013 and 2017. Zhang is yet to beat Andrea Petkovic in three meetings, having lost to the German 6-1, 6-3 in the second round of Strasbourg 2011 on clay, 6-4, 4-6, 6-2 in the first round of Wimbledon 2018 on grass and 6-3, 6-4 in the first round of The Bronx last month on hard courts.

Anna Blinkova is on a six-match winning streak following her victory at the New Haven 125K two weeks ago. The Russian scored a 6-2, 6-1 win over 2017 finalist Aleksandra Krunic in Australian Open 2017 qualifying, their only previous encounter.

Wildcard Peng Shuai's first-round upset of defending champion Wang Qiang was the 33-year-old's first Top 20 scalp since Zhuhai 2017, when she defeated Andrea Petkovic via retirement, and first completed win over a Top 20 player since Wuhan 2017, when Peng claimed a 7-6(7), 6-7(5), 7-6(3) triumph over Petra Kvitova. The former World No.14 was victorious over Nanchang semifinalist Nina Stojanovic 2-6, 6-4, 7-6(4) the only time they have previously played, in the 2016 Shenzhen ITF 100K quarterfinals en route to winning the title.

Nanchang quarterfinalist Viktorija Golubic defeated No.5 seed Katerina Siniakova 6-7(5), 6-2, 6-3 in their sole prior match in the first round of Linz 2017.

Qualifier Katarina Zavatska won the longest WTA main draw match of the year so far at three hours and 27 minutes over Fiona Ferro in the first round, and is the youngest player remaining in the draw. The 19-year-old is bidding to reach her second WTA quarterfinal following Rabat 2018.

ORDER OF PLAY (all courts start 2pm)

[3] Sofia KENIN (USA) vs [Q] Katarina ZAVATSKA (UKR)
[Q] Jasmine PAOLINI (ITA) vs [6] ZHENG Saisai (CHN)
Not before 7pm
Anna BLINKOVA (RUS) vs Aleksandra KRUNIC (SRB)

Bernarda PERA (USA) vs [WC] Samantha STOSUR (AUS)
[5] Katerina SINIAKOVA (CZE) vs Viktorija GOLUBIC (SUI)
Andrea PETKOVIC (GER) vs [4] ZHANG Shuai (CHN)
[WC] NG Kwan Yau (HKG) / ZHENG Saisai (CHN) vs [2] DUAN Yingying (CHN) / YANG Zhaoxuan (CHN)

After suitable rest
PENG Shuai (CHN) / Laura SIEGEMUND (GER) vs [4] Ellen PEREZ (AUS) / Sabrina SANTAMARIA (USA)
[1] Samantha STOSUR (AUS) / ZHANG Shuai (CHN) vs Kaitlyn CHRISTIAN (USA) / Sharon FICHMAN (CAN)