Season Comeback-Wins Leaderboard

Share of matches won after losing the first set, from real match_sets rows (set_num=1) joined to matches in the season. Set rows are stored from the match winner side, so the winner lost the opener exactly when winner_games < loser_games on the set-1 row (verified 5/5 against score_raw first sets); the match winner took that comeback by definition, so winner sides count won when the opener went against them and loser sides always count lost -- no inference, no estimates. Only COMPLETED matches count: a retirement or walkover after set 1 is not a comeback. Only players with first-set data on at least 20 matches qualify (ATP 2026: 594 eligible; WTA 2026: 210 eligible; tops ~27.6 at ship time). A player with no set-1 rows simply does not appear.