This deep dive provides a comprehensive summary of the Universal Tennis Rating (UTR), which is a modified Elo rating system designed to promote fair and competitive play by accurately measuring skill level between 1.00 and 16.50. The calculation methodology uses a weighted average of up to 30 recent match results, where the system calculates both a match rating and a match weight for each player. The match rating primarily reflects whether a player performs better than the algorithm's expectation based on the percentage of total games won relative to the opponent's rating difference. Key factors determining match weight include the format length, the competitiveness of the match (based on the closeness of opponent ratings), and the reliability of the opponent's existing UTR. Ultimately, players can improve their UTR by playing well—winning more games than expected regardless of the opponent's level—and playing often so the rating quickly reflects their current form.