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

Madison Keys

WOMENHot

Age31

BirthplaceRock Island, USA

Height1.78m

Weight66kg

Best HandRight-handed (two-handed backhand)

Backhand—

Recent Form

Win Rate:88%

Fatigue:0/100

Inactive:18 Days

Overall

Glicko-22.172

#12RD 66

Elo2.243

#13

Hard

Glicko-22.076

#18

Elo1.999

#18

Clay

Glicko-22.152

#18

Elo1.943

#12

Grass

Glicko-21.947

Elo1.775

Surface Record

HardClayGrass

20268-57-310-2

202523-89-44-3

20248-613-44-2

202318-115-39-1

202226-154-41-1

20213-93-45-2

Recent Matches

Linda NoskovaWimbledon - London2026-07-06Grass6-4 7-6(2)

Amanda AnisimovaWimbledon - London2026-07-04Grass3-6 6-2 6-3

Katie SwanWimbledon - London2026-07-02Grass6-1 6-4

Kayla DayWimbledon - London2026-06-30Grass6-7(5) 6-4 6-3

Tatjana MariaLexus Eastbourne Open - Eastbourne2026-06-27Grass7-5 6-4

Petra MarcinkoLexus Eastbourne Open - Eastbourne2026-06-26Grass6-1 ret.

Mccartney KesslerLexus Eastbourne Open - Eastbourne2026-06-25Grass6-3 6-1

Jessica Bouzas ManeiroLexus Eastbourne Open - Eastbourne2026-06-24Grass6-0 6-1

Talia GibsonLexus Eastbourne Open - Eastbourne2026-06-23Grass6-4 6-4

Jessica PegulaBerlin Tennis Open - Berlin2026-06-19Grass7-6(5) 7-6(8)

Karolina MuchovaBerlin Tennis Open - Berlin2026-06-18Grass6-4 7-5

Xinyu WangBerlin Tennis Open - Berlin2026-06-16Grass7-6(3) 6-1

Diana ShnaiderFrench Open - Paris2026-06-01Clay6-3 3-6 6-0

Victoria MbokoFrench Open - Paris2026-05-30Clay6-3 5-7 7-5

Antonia RuzicFrench Open - Paris2026-05-28Clay6-4 6-4

Hanne VandewinkelFrench Open - Paris2026-05-26Clay6-3 6-0

Diane ParryTrophee Clarins - Paris2026-05-17Clay3-6 3-3 ret.

Yuliia StarodubtsevaTrophee Clarins - Paris2026-05-16Clay1-6 6-2 6-3

Anastasia ZakharovaTrophee Clarins - Paris2026-05-15Clay6-4 6-1

Tiantsoa Rakotomanga RajaonahTrophee Clarins - Paris2026-05-14Clay6-4 6-1

Fiona FerroTrophee Clarins - Paris2026-05-12Clay6-4 6-2

Nikola BartunkovaInternazionali BNL d'Italia - Rome2026-05-10Clay6-3 1-6 6-4

Peyton StearnsInternazionali BNL d'Italia - Rome2026-05-08Clay4-6 6-4 6-2

Yuliia StarodubtsevaCredit One Charleston Open - Charleston2026-04-04Clay6-1 6-4

Belinda BencicCredit One Charleston Open - Charleston2026-04-03Clay4-6 6-3 6-2

Anna BondarCredit One Charleston Open - Charleston2026-04-02Clay6-2 7-5

Donna VekicCredit One Charleston Open - Charleston2026-04-01Clay6-2 6-3

Qinwen ZhengMiami Open - Miami2026-03-22Hard4-6 6-2 6-4

Elena Gabriela RuseMiami Open - Miami2026-03-21Hard6-0 6-3

Sonay KartalBNP Paribas Open - Indian Wells2026-03-09Hard2-6 6-2 6-3

Diane ParryBNP Paribas Open - Indian Wells2026-03-07Hard6-4 6-3

Jessica PegulaAustralian Open - Melbourne2026-01-26Hard6-3 6-4

Karolina PliskovaAustralian Open - Melbourne2026-01-24Hard6-3 6-3

Ashlyn KruegerAustralian Open - Melbourne2026-01-22Hard6-1 7-5

Oleksandra OliynykovaAustralian Open - Melbourne2026-01-20Hard7-6(6) 6-1

Victoria MbokoAdelaide International - Adelaide2026-01-15Hard6-4 4-6 6-2

Tereza ValentovaAdelaide International - Adelaide2026-01-14Hard6-4 6-1

Aryna SabalenkaBrisbane International - Brisbane2026-01-09Hard6-3 6-3

Diana ShnaiderBrisbane International - Brisbane2026-01-08Hard6-7(5) 7-6(5) 7-6(4)

Mccartney KesslerBrisbane International - Brisbane2026-01-06Hard6-4 6-3

Amanda AnisimovaWTA Finals - Riyadh2025-11-03I.Hard4-6 6-3 6-2

Iga SwiatekWTA Finals - Riyadh2025-11-01I.Hard6-1 6-2

Renata ZarazuaU.S. Open - New York2025-08-25Hard6-7(10) 7-6(3) 7-5

Elena RybakinaCincinnati Open - Cincinnati2025-08-13Hard6-7(3) 6-4 6-2

Aoi ItoCincinnati Open - Cincinnati2025-08-11Hard6-4 6-0

Eva LysCincinnati Open - Cincinnati2025-08-09Hard1-6 6-3 7-6(1)

Clara TausonOmnium Banque Nationale - Montreal2025-08-05Hard6-1 6-4

Karolina MuchovaOmnium Banque Nationale - Montreal2025-08-03Hard4-6 6-3 7-5

Caty McNallyOmnium Banque Nationale - Montreal2025-08-01Hard2-6 6-3 6-3

Laura SiegemundOmnium Banque Nationale - Montreal2025-07-30Hard6-2 6-1

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