Grace Min was the defending champion, having won the event in 2011, but did not compete.
Serena Williams defeated Sorana Cîrstea in the final, 6–2, 6–0 to win the women's singles tennis title at the 2013 Canadian Open. The victory gave Williams her third Canadian Open title, her eighth title of the season, and her 54th career WTA Tour title.
Samantha Crawford was the defending champion having won the 2012 event, but chose not to compete in 2013.
Lucie Šafářová was the defending champion, but decided not to participate this year.
Anna Tatishvili was the defending champion, but lost in the first round to Bernarda Pera.
Heather Watson was the defending champion but chose not to participate.
Andrea Petkovic was the defending champion, but she lost to Angelique Kerber in the semifinals.
Taylor Townsend was the defending champion, but she chose not to participate.
Anna Tatishvili was the defending champion, but she lost to Julia Boserup in the quarterfinals.
Jan Abaza and Melanie Oudin were the defending champions, but Oudin chose not to compete. Abaza partnered Amra Sadiković, but they lost in the first round to Tamira Paszek and Anna Tatishvili.
Annika Beck was the defending champion, but lost in the first round to Anna-Lena Friedsam.
Tereza Smitková was the defending champion, but chose not to participate this year.
Caroline Garcia won the title, defeating Louisa Chirico in the final 6–1, 6–3.
Tatjana Maria was the defending champion, but lost in the first round to Catherine Bellis.
Timea Bacsinszky was the defending champion, but chose to compete in Doha instead.
Louisa Chirico was the defending champion, but chose to participate in Stuttgart instead.
Petra Kvitová was the two-time defending champion, but lost in the semifinals to Agnieszka Radwańska.
Petra Kvitová defeated Dominika Cibulková in the final, 6–1, 6–1 to win the singles tennis title at the 2016 Wuhan Open. It was her second Wuhan Open title.
Yanina Wickmayer was the defending champion, but chose not to participate this year.
This was the first edition of the tournament.
Marta Kostyuk defeated Varvara Gracheva in the final, 6–3, 7–5 to win the singles tennis title at the 2023 ATX Open. It was her first WTA Tour singles title.
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Julie Coin 
Emily Webley-Smith 
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