Koreans sweep Seoul opener.

Three South Korean players — Back Dayeon, Park Sohyun and Ku Yeonwoo — all reached the second round of the Korea Open in Seoul, the first time three Koreans have done so at a WTA event in 42 years (since Rio de Janeiro 1984) (WTA / Alex Macpherson). The hed retains opener for the R1 home sweep; the body updates Wednesday’s R2 exits. The dek carries the Wednesday R2 update.

Back upset Yuan Yue 6–3, 4–6, 6–1 on Monday; on Tuesday wild cards Park beat ’s-Hertogenbosch champion Robin Montgomery 7–6(4), 6–3 and Ku beat qualifier Alevtina Ibragimova 6–3, 6–2 for their first tour-level wins (WTA). By Wednesday in Seoul, Park fell to No. 3 Lanlana Tararudee 6–7(5), 0–6 and Back to No. 5 Maya Joint 2–6, 1–6; Ku alone remains, facing No. 4 Elena-Gabriela Ruse on Thursday (Yonhap; NewsPim). The Park–Tararudee tiebreak is printed as pack 6–7(5); no third scoreline is invented. The R1 sweep remains the named mechanism of the hed even as the Wednesday exits update the live bracket.

Named actors and checkable milestones locked to WTA / Alex Macpherson, Yonhap, NewsPim and the REV 2a pack: Back Dayeon (R1 d. Yuan Yue 6–3, 4–6, 6–1; R2 l. Maya Joint 2–6, 1–6); Park Sohyun (R1 d. Robin Montgomery 7–6(4), 6–3 — first tour-level win; R2 l. Lanlana Tararudee 6–7(5), 0–6); Ku Yeonwoo (R1 d. Alevtina Ibragimova 6–3, 6–2 — first tour-level win; vs Elena-Gabriela Ruse Thu); 42-year first since Rio 1984 for three Koreans into a WTA second round. The desk does not invent Thursday’s Ku–Ruse result or rankings variance beyond named seeds.

The checkable record is the Korea Open first-round sweep by Back, Park and Ku — the first three-Korean WTA second-round cohort in 42 years — Back’s Monday upset of Yuan Yue, Park’s and Ku’s Tuesday first tour-level wins over Montgomery and Ibragimova, Wednesday’s R2 exits for Park against Tararudee and Back against Joint, and Ku remaining alone to face Ruse on Thursday at the Olympic Park courts in Seoul (WTA; Yonhap; NewsPim).

What comes next is checkable: Thursday’s Ku vs Ruse result on WTA/Yonhap wires; any further Korean doubles lines published by the tournament.

Floor: Koreans R1 sweep Seoul (Back d. Yuan 6–3, 4–6, 6–1; Park d. Montgomery 7–6(4), 6–3; Ku d. Ibragimova 6–3, 6–2) — first three Koreans into WTA R2 in 42 yrs (Rio 1984); Wed R2: Park l. Tararudee 6–7(5), 0–6; Back l. Joint 2–6, 1–6; Ku vs Ruse Thu (WTA; Yonhap; NewsPim); hed retains opener for R1 sweep; body updates Wed R2 exits.