2018 WTA Finals – Singles
| Singles | |
|---|---|
| 2018 WTA Finals | |
| Champion | Elina Svitolina |
| Runner-up | Sloane Stephens |
| Score | 3–6, 6–2, 6–2 |
| Draw | 8 (RR + elimination) |
| Seeds | 8 |
Elina Svitolina defeated Sloane Stephens in the final, 3–6, 6–2, 6–2 to win the singles tennis title at the 2018 WTA Finals.
Caroline Wozniacki was the defending champion, but was eliminated in the round-robin stage.
Naomi Osaka, Stephens, and Kiki Bertens made their debuts in the event.
This was the first time that the top four seeds were eliminated in the round robin stage, leaving the fifth to eighth seeds to qualify for the semifinals.