The ATP Challenger Tour is the secondary professional tennis circuit organized by the Association of Tennis Professionals (ATP).
The 2013 ATP Challenger Tour calendar comprised 149 tournaments, with prize money ranging from $35,000 up to $220,000.
[1][2] These tables present the number of singles (S) and doubles (D) titles won by each player and each nation during the season.
The players/nations are sorted by: 1) total number of titles (a doubles title won by two players representing the same nation counts as only one win for the nation); 2) a singles > doubles hierarchy; 3) alphabetical order (by family names for players).
To avoid confusion and double counting, these tables should be updated only after an event is completed.