# Tennis Statistics Glossary Source: https://tennis-db.com/wta/glossary Tour: WTA Definitions for the metrics and abbreviations used on TennisDB pages. ## Metric definitions - aces: Serves that land in and are not touched by the returner. - aces_per_match: Aces per match with serve stats available. - avg_set_margin: Average per-set game margin from the player's perspective. Positive values mean winning sets by more games on average. - break_points_converted_pct: Percentage of break-point chances won by the returner. - break_points_saved_pct: Percentage of break points won by the server. - career_w_l: Career main-draw singles wins and losses in TennisDB's match data. - clay_win_pct: Win percentage in completed main-draw singles matches on clay courts. - clay_win_streak: Longest consecutive winning streak in completed singles matches on clay courts, excluding walkovers. - clay_wins: Completed main-draw singles match wins on clay courts. - deciding_set_win_pct: Win percentage in matches that reached a deciding set. - deep_run_pct: Share of tournaments where the player reached the quarterfinals or better. - double_faults: Service points lost by missing both first and second serve. - double_faults_per_match: Double faults per match with serve stats available. - elo: Elo is a form-based rating that updates after each match. Beating stronger opponents earns more points; losing to weaker opponents costs more. - elo_percentile: Percentile rank by Elo rating. 99 means higher than 99% of comparable players. - elo_points: Current TennisDB Elo rating points. - elo_rank: A player's rank by current TennisDB Elo rating, not official ranking points. - fifth_set_win_pct: Win percentage in completed best-of-five-set singles matches that reached a fifth set. - finals_win_pct: Singles titles divided by singles finals reached. - first_serve_pct: Percentage of service points where the first serve landed in. - first_serve_points_won_pct: Percentage of points won after making a first serve. - five_set_win_pct: Win percentage in completed best-of-five-set singles matches. - grand_slam_champions_by_year: Year-by-year singles champions at the Australian Open, Roland Garros, Wimbledon, and US Open. - grand_slam_finals_win_pct: Grand Slam singles titles divided by Grand Slam singles finals reached. - grand_slam_titles: Singles titles won at the Australian Open, Roland Garros, Wimbledon, and US Open. - grand_slam_win_pct: Win percentage in completed Grand Slam singles matches. - grand_slam_win_streak: Longest consecutive winning streak in completed Grand Slam singles matches, excluding walkovers. - grand_slam_wins: Completed singles match wins at Grand Slam tournaments. - grass_win_pct: Win percentage in completed main-draw singles matches on grass courts. - grass_win_streak: Longest consecutive winning streak in completed singles matches on grass courts, excluding walkovers. - grass_wins: Completed main-draw singles match wins on grass courts. - hard_win_pct: Win percentage in completed main-draw singles matches on hard courts. - hard_win_streak: Longest consecutive winning streak in completed singles matches on hard courts, excluding walkovers. - hard_wins: Completed main-draw singles match wins on hard courts. - leader_active_view: Uses the same career measure but includes only players TennisDB currently classifies as active. - leader_career_view: Ranks career totals or career rates across the chosen era. - leader_current_rank_view: Lists currently ranked players in official ranking order and shows their full-history career statistic. - leader_single_season_view: Ranks the best individual player-seasons for the selected statistic across the chosen era. - leader_year_by_year_view: Shows the leading player or player-season separately for each season. - losing_streak: Longest consecutive losing streak in completed singles matches. - losses: Completed main-draw singles matches lost in TennisDB's match data. - masters_1000_champions_by_year: Year-by-year singles champions at tournaments currently categorized by TennisDB as Masters 1000 or WTA 1000. - masters_finals_win_pct: Masters 1000 or WTA 1000 singles titles divided by finals reached at that level. - masters_titles: Singles titles won at Masters 1000 or WTA 1000 events. - masters_win_pct: Win percentage in completed Masters 1000 or WTA 1000 singles matches. - masters_win_streak: Longest consecutive winning streak in completed Masters 1000 or WTA 1000 singles matches, excluding walkovers. - masters_wins: Completed singles match wins at Masters 1000 or WTA 1000 events. - matches: Completed main-draw singles matches in TennisDB's match data. - oldest_gs_title_winner: Oldest age when winning a Grand Slam singles title. - oldest_title_winner: Oldest age when winning a singles title. - peak_elo: The highest Elo rating a player has reached in TennisDB's ratings. - points_change_60d: Ranking-points change over the last 60 days. - prize_money: Career prize money when available from source data. - rank_change_60d: Ranking change over the last 60 days. - rank_movement_weekly: Ranking change since the previous ranking snapshot. - ranking_delta: Ranking change since the start of the season. - ranking_points: Official ranking points from the selected ranking snapshot. - recent_w_l: Win-loss record over the last 20 matches. - return_points_won_pct: Percentage of all points won while returning. - return_rating: Composite returning rating derived from available return stats. - sample: Matches with the required stat data available. - season_elo: For the current season, this is the latest TennisDB Elo rating. For past seasons, this is year-end Elo. - season_rank: For the current season, this is the latest ranking. For past seasons, this is the year-end ranking. - season_vs_expected: Wins above or below Elo prediction over the player's last 20 matches. Positive means outperforming expectations. - second_serve_points_won_pct: Percentage of points won after missing the first serve and making a second serve. - serve_rating: Composite serving rating derived from available serve stats. - service_points_won_pct: Percentage of all points won while serving. - set_margin: Average per-set game margin from the player's perspective. Positive values mean winning sets by more games on average. - set_win_pct: Sets won divided by total completed sets in eligible scored matches. - sos_percentile: Strength of Schedule percentile based on opponent quality. Higher means the player faced tougher opponents. - third_set_win_pct: Win percentage in completed best-of-three-set singles matches that reached a third set. - three_set_win_pct: Win percentage in completed best-of-three-set singles matches. - tiebreak_win_pct: Tiebreaks won divided by total tiebreaks played. - tiebreaks_lost: Tiebreaks lost. - tiebreaks_won: Tiebreaks won. - titles: Singles tournament titles in TennisDB's title data. - top_100_win_pct: Win percentage against opponents ranked in the Top 100 at the time of the match. - top_100_wins: Wins against opponents ranked in the Top 100 at the time of the match. - top_10_win_pct: Win percentage against opponents ranked in the Top 10 at the time of the match. - top_10_wins: Wins against opponents ranked in the Top 10 at the time of the match. - top_20_win_pct: Win percentage against opponents ranked in the Top 20 at the time of the match. - top_20_wins: Wins against opponents ranked in the Top 20 at the time of the match. - top_50_win_pct: Win percentage against opponents ranked in the Top 50 at the time of the match. - top_50_wins: Wins against opponents ranked in the Top 50 at the time of the match. - total_points_won_pct: Percentage of all completed points won. - vs_expected: Wins above or below Elo prediction over the last 20 matches. Positive means outperforming expectations. - w_l: Wins and losses in completed main-draw singles matches. - weeks_at_no1: Weeks spent at No. 1 in the official rankings. - win_pct: Wins divided by total completed main-draw matches. - win_streak: Longest consecutive winning streak in completed singles matches, excluding walkovers. - wins: Completed main-draw singles matches won in TennisDB's match data. - youngest_gs_title_winner: Youngest age when winning a Grand Slam singles title. - youngest_title_winner: Youngest age when winning a singles title. - Season age: A player's age on July 1 of the calendar season. TennisDB uses this fixed midseason date when labeling and comparing age-based seasons; it differs from exact age on a match or ranking date. ## Tournament categories - Grand Slam: Australian Open, Roland Garros, Wimbledon, and US Open. - WTA 1000: top-tier non-Slam events in TennisDB category normalization. - WTA 500 and 250: main-tour event categories below the 1000 level. - WTA Finals: season-ending championship event. ## Round labels - F: Final. - SF: Semifinal. - QF: Quarterfinal. - R16/R32/R64/R128: main-draw rounds by remaining draw size. - Q1/Q2/Q3/Q4: qualifying rounds. --- Canonical URL: https://tennis-db.com/wta/glossary Data source: TennisDB (tennis-db.com)