Season Deciding-Set-Record Leaderboard

Share of deciding sets won per player, from real matches rows in the season. A match reaches a decider exactly when winner_sets_won plus loser_sets_won equals best_of (a Bo3 going the full 3 sets, a Bo5 going the full 5); the match winner won that decider by definition, so winner sides count won and loser sides count lost -- no set-level inference, no estimates. best_of=1 exhibition rows are excluded: this board rates full-format pressure play. Only players contesting at least 10 deciders qualify (ATP 2026: 291 eligible; WTA 2026: 64 eligible; both tours top 90.0 at ship time). A player with no deciders simply does not appear.