Antonia Ruzic vs Kayla Day — Japan Open - Osaka Round of 16
Why
Surface+141 Hard Elo edgeSupports Ruzic A.
Overall ratingOverall Elo 1739Supports Ruzic A.
Long matches1 three-setter in 14 daysAgainst the prediction · Day K.
Head-to-headNo prior meetingsBoth players
This eventDidn't play here last yearBoth players
ELO1 811
Hard ELO1 705
Last 105–5
Age23
PlaysRight
EarningsCareer $1.7M2026 $993K
ELO1 784
Hard ELO1 683
Last 107–3
Age27
PlaysLeft
EarningsCareer $1.6M2026 $261K
Antonia Ruzic faces Kayla Day in the Japan Open - Osaka round of 16 on hard. Antonia Ruzic is the paper favourite — ranked #91, a roughly 140-point hard Elo advantage — but Kayla Day arrives in form, winning 7 of their last 10 on hard to Antonia Ruzic's 5 of 10.
Key context
- Freshness: Antonia Ruzic comes in with 5 days of rest and 82 games in 14d, vs Kayla Day's 2 and 48.
- Serve & return: Kayla Day leads on Serve Rating (60), Antonia Ruzic on Return Rating (32).
- Last match: Antonia Ruzic dropped the opening set before beating Paula Badosa 3–6 6–4 6–3.
Common opponents
5 shared · last 12 monthsRuzic A. and Day K. faced 5 of the same opponents in the last 12 months. Ruzic A. went 2–4 (33%) against them, Day K. 2–3 (40%). Results against comparable opponents are close (0 : 1 better-results split).
2–433%Ruzic A. · better vs 0Record vs common opponents2–340%Day K. · better vs 1
Vs common opponents · derived from scorelines
5–9Sets6–7
56–74Games66–65
0–0Tiebreaks1–2
1–1Deciding sets1–2
vs Keys M.#21L4-6 4-6Roland Garros · clayL7-6 4-6 3-6Wimbledon · grass
vs Samsonova L.#43L0-6 4-6Stuttgart · clayL6-7(4) 6-2 6-7(5)Guadalajara Open Akron - Guadalajara · hard
vs Preston T.#87W6-3 7-5Nottingham · grassW6-3 6-2Cincinnati · hard
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vs Yuan Y.#173L4-6 7-5 2-6Cluj-Napoca · hardW2-6 7-5 6-3Cincinnati · hard
vs Badosa P.#61Hard to compareW3-6 6-4 6-3Japan Open - Osaka · hardL4-6 3-6Charleston · clay
Head-to-head
They have not met before.
Evidence
Ruzic A.Day K.
FormLast 10 matches each · 2026
Win–loss5–57–3 (ahead)
Season win rate46% (23–27)71% (46–19) (ahead)
RatingUmpiry ELO
Overall ELO1811 (ahead)1784
Hard-court ELO1705 (ahead)1683
Serve vs returnLast 49 vs 62 matches
1st-serve points won58%67% (ahead)
Return points won43%46% (ahead)
Aces / match1.34.0 (ahead)
ClutchLast 49 vs 62 matches
Break points saved55%60% (ahead)
Draw
Odds
Cite this
Umpiry, "Antonia Ruzic vs Kayla Day — Japan Open - Osaka Round of 16", https://umpiry.com/match/2026-10-22/day-vs-ruzic-japan-open-osaka-r16?utm_source=cite (as of 22 October 2026).