# 2021 WTA Finals – Doubles

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.
Tímea Babos and Kristina Mladenovic were the two-time reigning champions, but failed to qualify this year.
Krejčíková and Siniaková clinched the year-end no. 1 as a team with their win against Sharon Fichman and Giuliana Olmos in their first round-robin match, and Siniaková secured the individual year-end no. 1 ranking by winning the title. Hsieh was also in contention for the top ranking. Krejčíková was the only player in this edition to qualify for both the singles and doubles tournaments.

## Seeds

* Barbora Krejčíková / Kateřina Siniaková (champions)
* Shuko Aoyama / Ena Shibahara (semifinals)
* Hsieh Su-wei / Elise Mertens (final)
* Nicole Melichar-Martinez / Demi Schuurs (semifinals)
* Samantha Stosur / Zhang Shuai (round robin)
* Alexa Guarachi / Desirae Krawczyk (round robin)
* Darija Jurak / Andreja Klepač (round robin)
* Sharon Fichman / Giuliana Olmos (round robin)

## Alternates

* Nadiia Kichenok / Raluca Olaru (Did not play)
* Marie Bouzková / Lucie Hradecká (Did not play)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Barbora Krejčíková Kateřina Siniaková | 3 | 6 | [10] | | | | |
| 4 | Nicole Melichar-Martinez Demi Schuurs | 6 | 3 | [6] | | | | |
| 4 | Nicole Melichar-Martinez Demi Schuurs | 6 | 3 | [6] | 1 | Barbora Krejčíková Kateřina Siniaková | 6 | 6 |
| | | | | | 3 | Hsieh Su-wei Elise Mertens | 3 | 4 |
| 2 | Shuko Aoyama Ena Shibahara | 2 | 2 | | 3 | Hsieh Su-wei Elise Mertens | 3 | 4 |
| 3 | Hsieh Su-wei Elise Mertens | 6 | 6 | | | | | |

### Group El Tajín

| | | Krejčíková Siniaková | Hsieh Mertens | Guarachi Krawczyk | Fichman Olmos | RR W–L | Set W–L | Game W–L | Standings |
| 1 | Barbora Krejčíková Kateřina Siniaková | | 6–3, 6–1 | 5–7, 7–6$^{(7–3)}$, [10–7] | 6–4, 6–1 | 3–0 | 6–1 (86%) | 37–22 (63%) | 1 |
| 3 | Hsieh Su-wei Elise Mertens | 3–6, 1–6 | | 7–6$^{(7–3)}$, 6–2 | 6–4, 7–6$^{(7–3)}$ | 2–1 | 4–2 (67%) | 30–30 (50%) | 2 |
| 6 | Alexa Guarachi Desirae Krawczyk | 7–5, 6–7$^{(3–7)}$, [7–10] | 6–7$^{(3–7)}$, 2–6 | | 0–6, 6–3, [11–9] | 1–2 | 3–5 (38%) | 28–35 (44%) | 3 |
| 8 | Sharon Fichman Giuliana Olmos | 4–6, 1–6 | 4–6, 6–7$^{(3–7)}$ | 6–0, 3–6, [9–11] | | 0–3 | 1–6 (14%) | 24–32 (43%) | 4 |

### Group Tenochtitlán

| | | Aoyama Shibahara | Melichar-Martinez Schuurs | Stosur Zhang | Jurak Klepač | RR W–L | Set W–L | Game W–L | Standings |
| 2 | Shuko Aoyama Ena Shibahara | | 6–4, 7–6$^{(7–5)}$ | 6–4, 3–6, [7–10] | 6–0, 6–4 | 2–1 | 5–2 (71%) | 34–25 (58%) | 1 |
| 4 | Nicole Melichar-Martinez Demi Schuurs | 4–6, 6–7$^{(5–7)}$ | | 6–2, 6–2 | 6–4, 3–6, [10–2] | 2–1 | 4–3 (57%) | 32–27 (54%) | 2 |
| 5 | Samantha Stosur Zhang Shuai | 4–6, 6–3, [10–7] | 2–6, 2–6 | | 7–6$^{(12–10)}$, 6–7$^{(4–7)}$, [5–10] | 1–2 | 3–5 (38%) | 28–35 (44%) | 4 |
| 7 | Darija Jurak Andreja Klepač | 0–6, 4–6 | 4–6, 6–3, [2–10] | 6–7$^{(10–12)}$, 7–6$^{(7–4)}$, [10–5] | | 1–2 | 3–5 (38%) | 28–35 (44%) | 3 |
Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-player ties, head-to-head records; 4. in three-player ties, (a) percentage of sets won (head-to-head records if two players remain tied), then (b) percentage of games won (head-to-head records if two players remain tied), then (c) WTA rankings.