Alexandra Panova/Diana Shnaider - Jaqueline Cristian/Gabriela Ruse

Dayeon Back secured a landmark victory after causing an enormous shock by knocking out world No. 13 Jelena Ostapenko at the Korea Open. World No. 569 Back recovered after losing the first set to win the second, and then survived a match point to win the third after a tie-break. Meanwhile, there were no such problems for world No. 4 Jessica Pegula, who comfortably dispatched Viktoria Hruncakova.