The match lasted two hours and 25 minutes.
This was the fourth game between the two in which the Ukrainian earned a second victory.
On her way to the final, Svitolina in the White Group defeated Czech players Petra Kvitova (6-3, 6-3) and Karolina Pliskova (6-3, 2-6, 6-3), as well as defending champion Caroline Wozniacki from Denmark (5-7, 7-5, 6-3). Elina also beat Dutch player Kiki Bertens (7-5, 6-7 (5-7), 6-4) in the semifinals.
Svitolina won the season-ending WTA Finals for the first time in her career. This was her fourth title in 2018 and 13th in her career.