Kristýna Plíšková was the defending champion but was no longer eligible to compete as a junior.
Alison Riske was the defending champion but lost to Yulia Putintseva in the second round.
Annika Beck was the defending champion, having won the event in 2012, but retired after losing the first set of her semifinal against Kristýna Plíšková.
Kristýna Plíšková was the defending champion having won this tournament on the ITF Women's Circuit in 2013. However, she chose not to participate.
Karolína Plíšková was the defending champion, but chose to compete in Tokyo instead.
The 2016 Stockton Challenger was a professional tennis tournament played on outdoor hard courts. It was the second edition of the tournament and part of the 2016 ITF Women's Circuit, offering a total of $50,000 in prize money. It took place in Stockton, California, United States, on 11–17 July 2016.
Nao Hibino was the defending champion, but chose not to participate.
Nao Hibino was the defending champion, but chose to participate in Montreal instead.
Anastasia Pavlyuchenkova was the defending champion, but lost in the quarterfinals to Dominika Cibulková.
Misaki Doi was the defending champion, but lost in the first round to Lauren Davis.
Kristýna Plíšková and Alison Van Uytvanck were the defending champions, but both players chose not to participate.
Elina Svitolina was the defending champion and successfully defended her title, defeating Simona Halep in a rematch of the previous year's final, 6–0, 6–4.
Daria Gavrilova was the defending champion, but lost to Aryna Sabalenka in the second round.
Barbora Strýcová was the defending champion, but lost in the quarterfinals to Alison Van Uytvanck.
Petra Kvitová was the defending champion, but chose not to participate.
Margarita Gasparyan was the defending champion. but lost in the second round to Danka Kovinić.
Greet Minnen and Alison Van Uytvanck were the defending champions, but chose not to defend their title.
Simona Halep defeated Elena Rybakina in the final, 3–6, 6–3, 7–6(7–5), to win the women's singles tennis title at the 2020 Dubai Tennis Championships. Halep saved a match point against Ons Jabeur in the second round.
Kristýna Plíšková was the defending champion, winning the last edition of the tournament in 2014, however she chose not to participate.
Bianca Andreescu was the defending champion from when the event was last held in 2019, but lost in the third round to Ons Jabeur.
Kristýna Plíšková 
Alison Van Uytvanck 
Robin Anderson 
