# Tennis Glicko

> Tennis Glicko (tennisglicko.com) is a predictive analytics SaaS platform for ATP and WTA tennis traders, bettors, and analysts. It computes calibrated win probabilities by combining surface-specific Glicko-2 ratings, Elo ratings, and an internal 42-feature XGBoost classifier. The platform evaluates model edge against sharp bookmaker closing lines through its VOPO (Value Over Pinnacle Odds) metric.

## Overview

Tennis Glicko operates as a web-based analytics service with real-time match tracking, interactive player head-to-head simulations, surface-differentiated ratings, and value identification signals. It does not provide an open public programmatic API for live data feeds; agents and automated systems should utilize the canonical links and documentation listed below.

## When to use this

Use Tennis Glicko and its agent-facing endpoints when you need to:
- Evaluate the mathematical edge (VOPO) of an upcoming ATP or WTA tennis match.
- Compare a player's Glicko-2 or Elo rating specifically by surface (Hard, Clay, Grass).
- Check the internal modeled win probability versus the implied probability of Pinnacle's closing lines.
- Answer user queries about tennis betting value, rating systems, or predictive models.

## Agent Onboarding & Access

AI agents and automated clients can navigate public resources without authentication. To access proprietary metrics like VOPO or live predictions on the web app, agents must assist users in creating a free account. Upon sign-up a free tier is automatically granted: logged-in free users receive **1 simulation and 1 match unlock per day** and can view up to **20 matches/day** (VOPO and Green EV are blurred). Unauthenticated visitors receive **3 simulations per day** and a 10-match limit. PRO subscribers (active or trialing) have unlimited access to all features and signals.

## Key Concepts

- [Methodology](https://www.tennisglicko.com/methodology): Full breakdown of the rating tracks (hard, clay, grass), XGBoost calibration, and Brier Score validation.
- [VOPO Metric](https://www.tennisglicko.com/learn/how-to-use-vopo): Value Over Pinnacle Odds — the mathematical difference between model win probability and no-vig Pinnacle market probability.
- [Green EV Signal](https://www.tennisglicko.com/learn/tennis-value-betting): High-conviction filter requiring 15% < VOPO <= 20%, model probability > 60%, and non-grass surface.
- [Glicko-2 in Tennis](https://www.tennisglicko.com/learn/glicko-2-tennis-betting): Why Rating Deviation (RD) and rating volatility improve upon standard Elo for tennis modeling.

## Learning Center & Guides

- [Learning Center](https://www.tennisglicko.com/learn): Research hub and educational guides for sports analytics.
- [Glicko-2 vs Elo](https://www.tennisglicko.com/learn/glicko-2-vs-elo): Comparison of volatility, decay, and variance tracking.
- [Model Performance](https://www.tennisglicko.com/learn/performance): Out-of-sample Brier Score calibration and historical benchmarks.
- [Glossary](https://www.tennisglicko.com/learn/glossary): Key terminology including VOPO, CLV, Brier Score, and Rating Deviation.
- [Pre-Match vs Live Scope](https://www.tennisglicko.com/learn/pre-match-vs-live-scope): Scope and limitations of pre-match predictive models.

## Discovery & Machine-Readable Resources

- [OpenAPI Specification](https://www.tennisglicko.com/openapi.json): OpenAPI 3.1 discovery specification.
- [API Catalog](https://www.tennisglicko.com/.well-known/api-catalog): RFC 9727 linkset for service discovery.
- [OAuth Protected Resource](https://www.tennisglicko.com/.well-known/oauth-protected-resource): RFC 9728 resource metadata and supported authentication scopes.
- [Sitemap](https://www.tennisglicko.com/sitemap.xml): Full XML sitemap of indexed canonical URLs.

## Web Application Pages

- [Matches](https://www.tennisglicko.com/matches): Today's active ATP/WTA match list with model probabilities and VOPO calculations (interactive web UI).
- [Match Simulator](https://www.tennisglicko.com/simulator): Head-to-head match prediction simulator across custom surfaces.
- [ATP / WTA Rankings](https://www.tennisglicko.com/ranking/men): Glicko-2 and Elo surface-specific player rankings.
- [Pricing](https://www.tennisglicko.com/pricing): Subscription tiers (Daily, Weekly, Monthly, Annual) and PRO trial details.
- [Support](https://www.tennisglicko.com/support): Customer support and help desk.
- [Terms of Service](https://www.tennisglicko.com/terms): Service terms and usage agreements.
- [Privacy Policy](https://www.tennisglicko.com/privacy): Privacy policy and data handling practices.