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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.

2018 WTA Finals
ChampionsHungary Tímea Babos
France Kristina Mladenovic
Runners-upCzech Republic Barbora Krejčíková
Czech Republic Kateřina Siniaková
Final score6–4, 7–5
Singles Doubles
← 2017 · WTA Finals · 2019 →

Babos successfully defended her title alongside Kristina Mladenovic, defeating Krejčíková and Siniaková in the final, 6–4, 7–5.

Krejčiková and Siniaková jointly secured the year-end WTA no. 1 doubles ranking by reaching the final. Babos and Mladenovic alongside Barbora Strýcová were also in contention for the top ranking at the beginning of the tournament.