UMPIRY
EN

Ena Koike vs Kayla Day — Japan Open - Osaka Qualifying Round of 32

Japan Open - OsakaQ32QualifyingHardSat 17 Oct · 11:30Final1h 46m
Ena KoikeWTA #318 · JPN
Kayla DayWTA #119 · USA
SetsGames0
53
2
76

Kayla Day defeated Ena Koike 7-5, 6-3 in the Osaka Japan Open qualifying second round. Day served four aces and converted 44 percent of her break points, while Koike hit one ace and converted 33 percent of her break points. Day won four service breaks to Koike's two en route to the win.

Generated automatically from Umpiry match data.

Key context

  • Match story: Kayla Day closed it out in two sets, 7–5 6–3.

How the match was decided

Auto-generated

Day K. took it in straight sets, with five breaks of serve.

  • Breaks of serveDay K. 5 · Koike E. 2
  • 1st-serve points wonDay K. 63% · Koike E. 71%
  • AcesDay K. 4 · Koike E. 1

Turning points

When the match moved
  1. Set 12–1Break backDay K. · Broke back
  2. Set 14–3Break backDay K. · Broke back
  3. Set 15–6BreakDay K. · Broke, never broken back
  4. Set 23–4BreakDay K. · Broke, never broken back
  5. Set 23–6SetDay K. · Broke to take the set

Win probability during the match

i
0%Koike E.
100%Day K.
Final · 5–7 3–6
1–02–02–13–14–14–24–34–45–45–55–65–71–01–12–12–23–23–33–43–53–6Set 1 · 5–7Set 2 · 3–6
  1. Break by Koike E.
  2. Break by Day K.
  3. Break by Koike E.
  4. Break by Day K.
  5. Break by Day K.
  6. Set won by Day K.
  7. Break by Day K.
  8. Break by Day K.
  9. Set won by Day K.
Ena KoikeKayla Day
Recorded during the match
Serve flowKoike E. broken 5 times · Day K. broken twice.
  • Hold to love/15
  • Hold to 30
  • Hold to 40 / deuce
  • Broken
  • Result unknown
Koike E.
6/11Day K.
8/10
Set 1Set 2

Match momentum

Whole matchKoike E.Day K.
EvenKoike E.Day K.
Late momentumDay K.60
4Last 12 points8
5Last 3 games12
2/4Break points4/8

Break of serve

Match statistics

Koike E.Day K.
Serve
  • 1Aces4
  • 4Double faults2
  • 71%1st serve points won63%
  • 55% · 6/11Service games held80% · 8/10
Return
  • 33%Break points won44%
  • 2Breaks of serve5

Serve & return performance

Key performance gaps
First-serve pointsKoike E. won 71% of points behind the first serve, Day K. 63%. Largest performance gap of the match.+8 ptsKoike E.1st-serve pts won71%Day K.1st-serve pts won63%

Common opponents

0 shared · last 12 months
No common opponents in the last 12 months. Surface form and ELO carry more weight here.

Head-to-head

1 meeting · Day K. leads 1–0
01

Draw

Closing odds

Player context

Before the match
Koike E.Day K.1 599ELO1 7911 567Hard ELO1 6902–8Last 106–419Age27RightPlaysLeftCareer $66K2026 $25KEarningsCareer $1.6M2026 $261K

Match info

  • Started11:30 local
  • Duration1h 46m

Cite this

Kayla Day beat Ena Koike 5-7 3-6. Umpiry, "Ena Koike vs Kayla Day — Japan Open - Osaka Qualifying Round of 32", https://umpiry.com/match/2026-10-17/day-vs-koike-japan-open-osaka-q32?utm_source=cite (as of 17 October 2026).