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

Qinwen Zheng

WOMEN

Age23

BirthplaceShiyan, China

Height1.78m

Weight—

Best HandRight

Backhand—

Recent Form

Win Rate:50%

Fatigue:15/100

Inactive:7 Days

Overall

Glicko-22.024

#34RD 77

Elo2.055

#44

Hard

Glicko-22.060

#21

Elo2.000

#17

Clay

Glicko-22.139

#22

Elo1.939

#14

Grass

Glicko-21.446

#2221

Elo1.453

#1944

Surface Record

HardClayGrass

20266-43-32-4

20258-610-42-2

202432-1217-41-2

202326-1210-40-3

202216-115-42-3

20210-21-1—

Recent Matches

Barbora KrejcikovaAthens Open - Athens2026-07-17Hard6-4 6-4

Elena MicicAthens Open - Athens2026-07-15Hard6-4 6-1

Jessica Bouzas ManeiroAthens Open - Athens2026-07-13Hard7-5 6-1

Katerina SiniakovaWimbledon - London2026-06-29Grass6-4 6-4

Clara TausonBad Homburg Open - Bad Homburg2026-06-24Grass5-7 6-4 6-2

Solana SierraBad Homburg Open - Bad Homburg2026-06-22Grass7-5 4-6 6-4

Talia GibsonLexus Nottingham Open - Nottingham2026-06-17Grass6-3 7-6(10)

Maria SakkariLexus Nottingham Open - Nottingham2026-06-15Grass4-6 7-6(1) 6-4

Jaqueline CristianThe HSBC Championships - London2026-06-08Grass6-4 7-6(4)

Maja ChwalinskaFrench Open - Paris2026-05-25Clay6-4 6-0

Jelena OstapenkoInternazionali BNL d'Italia - Rome2026-05-09Clay4-6 6-4 6-4

Cristina BucsaInternazionali BNL d'Italia - Rome2026-05-07Clay7-6(6) 6-2

Anna BondarInternazionali BNL d'Italia - Rome2026-05-05Clay3-6 6-3 6-4

Elena RybakinaMutua Madrid Open - Madrid2026-04-26Clay4-6 6-4 6-3

Sofia KeninMutua Madrid Open - Madrid2026-04-24Clay1-6 6-3 6-3

Aryna SabalenkaMiami Open - Miami2026-03-23Hard6-3 6-4

Madison KeysMiami Open - Miami2026-03-22Hard4-6 6-2 6-4

Sloane StephensMiami Open - Miami2026-03-21Hard6-3 6-2

Antonia RuzicBNP Paribas Open - Indian Wells2026-03-07Hard6-4 7-5

Elena RybakinaQatar TotalEnergies Open - Doha2026-02-11Hard4-6 6-2 7-5

Alycia ParksQatar TotalEnergies Open - Doha2026-02-10Hard7-6(4) 3-6 6-2

Sofia KeninQatar TotalEnergies Open - Doha2026-02-09Hard4-6 6-1 6-2

Linda NoskovaChina Open - Beijing2025-09-29Hard6-4 3-6 3-0 ret.

Emiliana ArangoChina Open - Beijing2025-09-27Hard6-3 6-2

Katerina SiniakovaWimbledon - London2025-07-01Grass7-5 4-6 6-1

Amanda AnisimovaLTA London Championships - London2025-06-14Grass6-2 4-6 6-4

Emma RaducanuLTA London Championships - London2025-06-13Grass6-2 6-4

Mccartney KesslerLTA London Championships - London2025-06-12Grass6-3 4-6 7-5

Aryna SabalenkaFrench Open - Paris2025-06-03Clay7-6(3) 6-3

Liudmila SamsonovaFrench Open - Paris2025-06-01Clay7-6(5) 1-6 6-3

Victoria MbokoFrench Open - Paris2025-05-30Clay6-3 6-4

Emiliana ArangoFrench Open - Paris2025-05-28Clay6-2 6-3

Anastasia PavlyuchenkovaFrench Open - Paris2025-05-25Clay6-4 6-3

Cori GauffInternazionali BNL d'Italia - Rome2025-05-15Clay7-6(3) 4-6 7-6(4)

Aryna SabalenkaInternazionali BNL d'Italia - Rome2025-05-14Clay6-4 6-3

Bianca Vanessa AndreescuInternazionali BNL d'Italia - Rome2025-05-12Clay7-5 6-1

Magdalena FrechInternazionali BNL d'Italia - Rome2025-05-11Clay6-3 6-2

Olga DanilovicInternazionali BNL d'Italia - Rome2025-05-09Clay6-1 6-4

Anastasia PotapovaMutua Madrid Open - Madrid2025-04-25Clay6-4 6-4

Ekaterina AlexandrovaCredit One Charleston Open - Charleston2025-04-04Clay6-1 6-4

Elise MertensCredit One Charleston Open - Charleston2025-04-03Clay6-3 3-6 6-3

Maria SakkariCredit One Charleston Open - Charleston2025-04-02Clay6-4 6-1

Aryna SabalenkaMiami Open - Miami2025-03-25Hard6-2 7-5

Ashlyn KruegerMiami Open - Miami2025-03-24Hard6-2 7-6(3)

Taylor TownsendMiami Open - Miami2025-03-22Hard6-1 7-6(3)

Lauren DavisMiami Open - Miami2025-03-20Hard6-1 7-5

Iga SwiatekBNP Paribas Open - Indian Wells2025-03-13Hard6-3 6-3

Marta KostyukBNP Paribas Open - Indian Wells2025-03-11Hard6-3 6-2

Lulu SunBNP Paribas Open - Indian Wells2025-03-09Hard6-4 7-5

Victoria AzarenkaBNP Paribas Open - Indian Wells2025-03-07Hard6-3 6-4

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