A spot in the next round is at stake on Thursday, when Jelena Ostapenko goes up against Taylah Preston in the Seoul round of 16. Jelena Ostapenko has won 6 of the last 10. Taylah Preston has won 7 of the last 10.

The serve is where this match separates: Ostapenko has been winning 64.9% of first-serve points to Preston's 59.4%, and on hard that gap compounds fast. Little separates them; Ostapenko gets the nod on the finest of margins.