Margarita Gasparyan and Alexandra Panova were the defending champions, but Gasparyan could not participate due to injury. Panova teamed up with Evgeniya Rodina, but they retired in the first round against Demi Schuurs and Renata Voráčová.
Chang Kai-chen and Hsieh Su-wei were the defending champions, but Chang chose not to participate, while Hsieh chose to compete at the 2018 Mutua Madrid Open.
Ashleigh Barty and Casey Dellacqua were the defending champions, but Dellacqua retired from professional tennis in February 2018, and Barty decided not to participate.
Mihaela Buzărnescu and Raluca Olaru were the defending champions, but Buzărnescu chose not to participate this year. Olaru played alongside Darija Jurak, but lost in the semifinals to Daria Gavrilova and Ellen Perez.
Margarita Gasparyan and Ekaterina Makarova were the defending champions, but Gasparyan chose not to defend her title. Makarova retired from professional tennis in January 2020.
The Phillip Island Trophy was a new addition to the WTA Tour in 2021.
The 2021 St. Petersburg Ladies' Trophy is a professional tennis tournament played on indoor hard courts. It is the 12th edition of the tournament and a WTA 500 tournament on the 2021 WTA Tour. The tournament is held between 15 and 21 March 2021.
Defending champion Hsieh Su-wei and her partner, Elise Mertens, defeated Veronika Kudermetova and Elena Vesnina in the final, 3–6, 7–5, 9–7, to win the ladies' doubles tennis title at the 2021 Wimbledon Championships. The pair saved two championship points en route to their first major title together.
This was the first edition of the tennis tournament.
Samantha Stosur and Zhang Shuai defeated Coco Gauff and Caty McNally in the final, 6–3, 3–6, 6–3 to win the women's doubles title at the 2021 US Open. It was Stosur's fourth major title in women's doubles and eighth major overall, as well as Zhang's second major title; this was the team's second major title, following the 2019 Australian Open. This was the first major final for Gauff and for McNally.
Shuko Aoyama and Ena Shibahara were the defending champions, having won the previous event in 2019, but chose not to participate.
This was the first edition of the tournament.
Barbora Krejčíková and Kateřina Siniaková defeated Hsieh Su-wei and Elise Mertens in the final, 6–3, 6–4 to win the doubles tennis title at the 2021 WTA Finals.
Anna Kalinskaya and Caty McNally defeated Alicja Rosolska and Erin Routliffe in the final, 6–3, 6–7(5–7), [10–4] to win the doubles tennis title at the 2022 St. Petersburg Ladies' Trophy.
Gabriela Dabrowski and Giuliana Olmos defeated Desirae Krawczyk and Demi Schuurs in the final, 7–6(7–1), 5–7, [10–7] to win the women's doubles tennis title at the 2022 Madrid Open. This was Dabrowski's third consecutive final at the tournament, having lost the previous two editions in 2021 and 2019.
Veronika Kudermetova and Anastasia Pavlyuchenkova defeated reigning champion Giuliana Olmos and partner Gabriela Dabrowski in the final, 1–6, 6–4, [10–7] to win the women's doubles tennis title at the 2022 Italian Open.
Eri Hozumi and Makoto Ninomiya defeated Alicja Rosolska and Erin Routliffe in the final, 6–4, 6–7(5–7), [10–5] to win the doubles tennis title at the 2022 Bad Homburg Open.
Barbora Krejčíková and Kateřina Siniaková defeated the defending champion Elise Mertens and her partner Zhang Shuai in the final, 6–2, 6–4 to win the ladies' doubles tennis title at the 2022 Wimbledon Championships. It was their second Wimbledon title together and fifth major title together overall.
Kristina Mladenovic and Yanina Wickmayer defeated Asia Muhammad and Sabrina Santamaria in the final, 6–3, 6–2 to win the women's doubles tennis title at the 2022 Korea Open.
Harriet Dart and Asia Muhammad were the defending champions but Dart chose not to participate.
Nadiia Kichenok 
Raluca Olaru 
Kaitlyn Christian 
