Alberta Brianti was the defending champion, but chose not to participate.
Anastasiya Yakimova won the title by defeating Erika Sema in the final 7–6(7–3), 6–3.
Sachie Ishizu was the defending champion, but lost to Tamarine Tanasugarn in the second round.
Chang Kai-chen won the title, defeating Mandy Minella 6–4, 1–6, 6–4 in the final.
Misaki Doi is the defending champion but lost to Tamarine Tanasugarn 5–7, 5–7 in the quarterfinals.
Melinda Czink was the defending champion, but chose not to participate.
Stéphanie Dubois was the defending champion, but lost to Julia Cohen in the first round.
Serena Williams successfully defended her title after defeating lucky loser Coco Vandeweghe in the final, 7–5, 6–3. It was the first all-American final on the WTA Tour since the 2009 WTA Tour Championships and the first on American soil since Los Angeles in 2004.
Andrea Hlaváčková was the defending champion, but chose to participate at the 2012 Rogers Cup instead.
Anastasiya Yakimova was the defending champion, having won the event in 2011, but chose not to participate in 2012.
Chanelle Scheepers was the defending champion, but was unsuccessful in her title defense, losing to 4th seed Urszula Radwańska in the Quarterfinals.
Hsieh Su-wei won the final, defeating Laura Robson 6–3, 5–7, 6–4 in the final.
Marion Bartoli was the defending champion, but chose not to compete.
Heather Watson won the title after a marathon 3 hour 12 minute battle with Chang Kai-chen. The match saw Watson hold match point before Chang came back and won the second set. Chang went up a break and had multiple match points at 5–4 before Watson broke and won a final-set tiebreak. Watson won by a score of 7–5, 5–7, 7–6(7–4). That meant for the first time in 25-year history, a British female won a WTA tournament.
Monique Adamczak and Stephanie Bengson were the defending champions, having won the event in 2012, but both players chose not to defend their titles the year after.
Karolína Plíšková was the defending champion, but lost in the semifinals to Dominika Cibulková.
Ons Jabeur was the defending champion, having won the event in 2013, but chose to compete at the $25,000 ITF tournament in Tunis.
Liu Fangzhou was the defending champion, but chose to participate in Hua Hin instead.
Nao Hibino was the defending champion, but chose to participate in Nürnberg instead.
Jelena Janković was the defending champion, but chose to participate in Florianópolis instead.
Kristýna Plíšková was the defending champion, but chose not to participate.
Lee Ya-hsuan and Kotomi Takahata were the defending champions, but Lee chose not to participate. Takahata partnered Erika Sema, but lost in the first round to Han Xinyun and Jessica Moore.
Risa Ozaki was the defending champion, but chose to participate in Toronto instead.
Risa Ozaki was the defending champion, but chose to compete in Tokyo instead.
