| Doubles | |
|---|---|
| 2018 Connecticut Open | |
| Champions |  Andrea Sestini Hlaváčková Barbora Strýcová |
| Runners-up |  Hsieh Su-wei  Laura Siegemund |
| Final score | 6–4, 6–7(7–9), [10–4] |
Gabriela Dabrowski and Xu Yifan were the defending champions, [1] but chose not to participate this year.
Andrea Sestini Hlaváčková and Barbora Strýcová won the title, defeating Hsieh Su-wei and Laura Siegemund in the final, 6–4, 6–7(7–9), [10–4]
Andrea Sestini Hlaváčková / Barbora Strýcová (champions)
Demi Schuurs / 
Katarina Srebotnik (first round, retired) Kiki Bertens / 
Johanna Larsson (quarterfinals)
Irina-Camelia Begu / Monica Niculescu (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | A Sestini Hlaváčková B Strýcová | 6 | 6 | ||||||||||||||||||||||||
 S Aoyama  L Marozava | 2 | 1 | 1 | A Sestini Hlaváčková B Strýcová | 6 | 6 | |||||||||||||||||||||
 D Jurak R Olaru | 62 | 77 | [10] | D Jurak R Olaru | 3 | 3 | |||||||||||||||||||||
| D Jakupović R Voráčová | 77 | 62 | [8] | 1 | A Sestini Hlaváčková B Strýcová | 3 | 6 | [12] | |||||||||||||||||||
| 3 | K Bertens J Larsson | 6 | 6 |  A Rosolska  A Spears | 6 | 3 | [10] | ||||||||||||||||||||
| Alt |  M Adamczak  O Kalashnikova | 3 | 4 | 3 | K Bertens J Larsson | 6 | 5 | [5] | |||||||||||||||||||
| A Rosolska A Spears | 6 | 6 | A Rosolska A Spears | 4 | 7 | [10] | |||||||||||||||||||||
| R Atawo A-L Grönefeld | 3 | 4 | 1 | A Sestini Hlaváčková B Strýcová | 6 | 67 | [10] | ||||||||||||||||||||
| Alt |  K Flipkens A Van Uytvanck | 77 | 4 | [6] | PR | S-w Hsieh L Siegemund | 4 | 79 | [4] | ||||||||||||||||||
| WC | Ka Plíšková Kr Plíšková | 64 | 6 | [10] | WC | Ka Plíšková Kr Plíšková | 6 | 5 | [10] | ||||||||||||||||||
 N Kichenok An Rodionova | 2 | 77 | [10] | N Kichenok An Rodionova | 4 | 7 | [5] | ||||||||||||||||||||
| 4 | I-C Begu M Niculescu | 6 | 64 | [8] | WC | Ka Plíšková Kr Plíšková | |||||||||||||||||||||
| PR | S-w Hsieh L Siegemund | 62 | 77 | [10] | PR | S-w Hsieh L Siegemund | w/o | ||||||||||||||||||||
| WC | D Krawczyk S Vickery | 77 | 64 | [8] | PR | S-w Hsieh L Siegemund | 4 | 6 | [10] | ||||||||||||||||||
 L Arruabarrena L Kichenok | 6 | 0 | L Arruabarrena L Kichenok | 6 | 3 | [8] | |||||||||||||||||||||
| 2 | D Schuurs K Srebotnik | 4 | 1r | ||||||||||||||||||||||||
Ekaterina Makarova and Elena Vesnina were the defending champions, but Vesnina was unable to compete due to an injury. Makarova played alongside Vera Zvonareva, but lost in the second round to Elise Mertens and Demi Schuurs.
Tímea Babos and Kristina Mladenovic won the women's doubles tennis title at the 2018 Australian Open, defeating Ekaterina Makarova and Elena Vesnina in the final, 6–4, 6–3. It was the first Grand Slam title for Babos, who became the first Hungarian player to win a Grand Slam event since Andrea Temesvári in the 1986 French Open and the second Grand Slam title for Mladenovic.
Ashleigh Barty and CoCo Vandeweghe defeated Tímea Babos and Kristina Mladenovic in the final, 3–6, 7–6(7–2), 7–6(8–6) to win the women's doubles tennis title at the 2018 US Open.
Tímea Babos and Anastasia Pavlyuchenkova were the defending champions, but chose not to participate this year.
Abigail Spears and Katarina Srebotnik were the defending champions, but chose not to compete together. Spears played alongside Alicja Rosolska, but lost in the first round to Mihaela Buzărnescu and Alizé Cornet. Srebotnik teamed up with Shuko Aoyama, but lost in the first round to Anastasia Pavlyuchenkova and Olga Savchuk.
Ekaterina Makarova and Elena Vesnina were the defending champions, but lost to Hsieh Su-wei and Peng Shuai in the semifinals.
Latisha Chan and Martina Hingis were the defending champions, but Hingis retired from professional tennis at the end of 2017. Chan played alongside her sister Chan Hao-ching, but lost in the second round to Hsieh Su-wei and Barbora Strýcová.
Gabriela Dabrowski and Xu Yifan were the defending champions, but lost in the first round to Elise Mertens and Demi Schuurs.
Latisha Chan and Martina Hingis were the defending champions, but Hingis retired from professional tennis at the end of 2017. Chan played alongside Bethanie Mattek-Sands, but lost in the quarterfinals to Andrea Sestini Hlaváčková and Barbora Strýcová.
Latisha Chan and Martina Hingis were the defending champions, but Hingis retired from professional tennis at the end of 2017. Chan played alongside Bethanie Mattek-Sands, but lost in the first round to Svetlana Kuznetsova and Karolína Plíšková.
Bethanie Mattek-Sands and Lucie Šafářová were the defending champions, but chose not to compete together this year. Mattek-Sands played alongside Latisha Chan, but lost in the second round to Irina Bara and Mihaela Buzărnescu. Šafářová teamed up with Svetlana Kuznetsova, but lost in the second round to Sorana Cîrstea and Sara Sorribes Tormo.
Ashleigh Barty and Casey Dellacqua were the defending champions, but Dellacqua retired from professional tennis in February 2018. Barty played alongside CoCo Vandeweghe, but lost in the first round to Tímea Babos and Kristina Mladenovic.
Latisha Chan and Martina Hingis were the defending champions, but Hingis retired from professional tennis at the end of 2017. Chan played alongside Peng Shuai, but they lost in the first round to Irina-Camelia Begu and Mihaela Buzărnescu.
Ekaterina Makarova and Elena Vesnina were the two-time defending champions, but Vesnina chose not to participate this year.
Latisha Chan and Martina Hingis were the defending champions, but Hingis retired from professional tennis at the end of 2017 and Chan chose to prepare for the Asian Games instead.
Andreja Klepač and María José Martínez Sánchez were the defending champions, but chose not to participate.
Latisha Chan and Martina Hingis were the defending champions, but Hingis retired from professional tennis at the end of 2017 and Chan could not participate due to a medical condition.
Latisha Chan and Martina Hingis were the defending champions, but Hingis retired from professional tennis at the end of 2017 and Chan could not participate due to a medical condition.
Tímea Babos and Andrea Sestini Hlaváčková were the defending champions, but did not qualify together this year. Sestini Hlaváčková teamed up with Barbora Strýcová, but lost in the semifinals to Barbora Krejčíková and Kateřina Siniaková.
Andrea Sestini Hlaváčková and Barbora Strýcová were the defending champions, but Sestini Hlaváčková did not participate due to maternity leave. Strýcová played alongside Hsieh Su-wei, but lost in the second round to Jeļena Ostapenko and Dayana Yastremska.