What is VOPO in tennis betting?

VOPO (Value Over Pinnacle Odds) is the difference between Tennis Glicko's internal win probability (average of Glicko-2 and Elo models) and the implied probability from Pinnacle's odds. A positive VOPO means the market is undervaluing a player.

What is Green EV in tennis betting?

Green EV is Tennis Glicko's high-conviction value signal. It triggers when VOPO exceeds 12% AND the internal win probability is above 50% — indicating the market is significantly mispricing a player.

How accurate is Tennis Glicko?

Tennis Glicko has 72.8% predictive accuracy over the last 30 days, with a Brier Score of 0.1775 — a standard probabilistic calibration metric used in forecasting.

Why use Glicko-2 instead of ATP rankings for tennis predictions?

ATP rankings are a lagging indicator — they ignore surface specialization, injury returns, scheduling fatigue, and form swings. Glicko-2 updates after every match, adjusts for opponent quality, and models rating uncertainty, making it significantly more accurate for predicting match outcomes.

Rankings

Kimberly Birrell

WOMEN

Age28

BirthplaceDusseldorf, Germany

Height1.70m

Weight62kg

Best HandRight

Backhand—

Recent Form

Win Rate:50%

Fatigue:0/100

Inactive:22 Days

Overall

Glicko-21.959

#75RD 65

Elo2.007

#67

Hard

Glicko-21.988

#50

Elo1.908

#40

Clay

Glicko-21.710

#439

Elo1.530

#801

Grass

Glicko-21.552

#126

Elo1.529

#128

Surface Record

HardClayGrass

20268-81-22-4

202515-130-32-4

20246-8—2-1

20236-81-21-1

20221-1——

20212-3——

Recent Matches

Sorana CirsteaWimbledon - London2026-07-02Grass6-3 6-4

Alina KorneevaWimbledon - London2026-06-30Grass6-3 0-6 6-2

Petra MarcinkoLexus Eastbourne Open - Eastbourne2026-06-24Grass6-1 6-4

Barbora KrejcikovaLexus Eastbourne Open - Eastbourne2026-06-23Grass6-3 7-6(6)

Peyton StearnsLexus Eastbourne Open - Eastbourne2026-06-21Grass7-5 6-0

Indianna SpinkLexus Eastbourne Open - Eastbourne2026-06-20Grass7-6(6) 6-4

Ann LiLexus Nottingham Open - Nottingham2026-06-16Grass4-6 7-6(3) 6-4

Katie VolynetsLexus Nottingham Open - Nottingham2026-06-14Grass2-6 6-4 7-6(3)

Mingge XuLexus Nottingham Open - Nottingham2026-06-13Grass6-2 6-3

Magda LinetteLibema Open - 's-Hertogenbosch2026-06-08Grass2-6 6-1 6-2

Oleksandra OliynykovaFrench Open - Paris2026-05-28Clay6-3 0-6 7-6(5)

Jessica PegulaFrench Open - Paris2026-05-26Clay1-6 6-3 6-3

Katie BoulterTrophee Clarins - Paris2026-05-12Clay7-5 7-6(2)

Yue YuanInternazionali BNL d'Italia - Rome2026-05-04Clay6-3 6-2

Panna UdvardyMutua Madrid Open - Madrid2026-04-22Clay6-4 1-6 6-1

Harriet DartBillie Jean King Cup, Qualifiers, AUS-GBR 1-32026-04-10Hard4-6 6-3 6-3

Ann LiMiami Open - Miami2026-03-19Hard6-2 2-6 6-3

Yue YuanMiami Open - Miami2026-03-17Hard6-2 2-6 6-4

Viktoriya TomovaMiami Open - Miami2026-03-16Hard6-3 6-2

Lanlana TararudeeAustin 125 - Austin2026-03-13Hard6-4 7-6(4)

Mccartney KesslerAustin 125 - Austin2026-03-12Hard6-7(3) 7-6(3) 6-0

Kamilla RakhimovaAustin 125 - Austin2026-03-11Hard6-2 1-6 6-2

Ella SeidelAustin 125 - Austin2026-03-10Hard7-6(7) 6-1

Victoria MbokoBNP Paribas Open - Indian Wells2026-03-06Hard6-4 7-6(5)

Oksana SelekhmetevaBNP Paribas Open - Indian Wells2026-03-04Hard6-1 6-4

Peyton StearnsATX Open - Austin2026-02-28Hard6-3 3-6 6-2

Ajla TomljanovicATX Open - Austin2026-02-27Hard6-3 6-3

Caroline DolehideATX Open - Austin2026-02-26Hard6-4 6-2

Petra MarcinkoATX Open - Austin2026-02-24Hard0-6 6-3 6-4

Elena RybakinaDubai Duty Free Championships - Dubai2026-02-17Hard6-1 6-2

Tatjana MariaDubai Duty Free Championships - Dubai2026-02-15Hard6-4 3-6 7-5

Katie VolynetsDubai Duty Free Championships - Dubai2026-02-14Hard6-3 6-1

Tereza ValentovaDubai Duty Free Championships - Dubai2026-02-13Hard0-6 6-3 5-0 ret.

Sonay KartalQatar TotalEnergies Open - Doha2026-02-07Hard7-5 6-3

Renata ZarazuaQatar TotalEnergies Open - Doha2026-02-06Hard6-2 6-2

Maddison InglisAustralian Open - Melbourne2026-01-20Hard7-6(6) 6-7(9) 6-4

Victoria MbokoAdelaide International - Adelaide2026-01-16Hard6-2 6-1

Jaqueline CristianAdelaide International - Adelaide2026-01-15Hard5-7 6-1 7-5

Anastasia PotapovaAdelaide International - Adelaide2026-01-13Hard6-4 6-4

Amanda AnisimovaBrisbane International - Brisbane2026-01-07Hard6-1 6-3

Rebecca SramkovaBrisbane International - Brisbane2026-01-05Hard6-4 3-6 6-3

Talia GibsonW75 Sydney 12025-11-22Hard6-4 3-6 6-3

Ya-Yi YangW75 Sydney 12025-11-21Hard6-3 6-2

Miho KuramochiW75 Sydney 12025-11-20Hard7-6(5) 6-1

Lea MaW75 Sydney 12025-11-19Hard7-5 6-2

Nauhany Vitoria Leme Da SilvaBillie Jean King Cup, PO, Group E2025-11-16Hard6-4 3-6 6-1

Matilde JorgeBillie Jean King Cup, PO, Group E2025-11-14Hard6-4 6-4

Janice TjenChennai Open - Chennai2025-11-02Hard6-4 6-3

Joanna GarlandChennai Open - Chennai2025-11-01Hard6-7(2) 6-3 7-5

Donna VekicChennai Open - Chennai2025-10-31Hard6-4 6-0

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