| Details | |
|---|---|
| Duration | 1 January 2001 – 9 December 2001 |
| Edition | 24th |
| Tournaments | 137 |
| Achievements (singles) | |
← 2000 2002 → | |
The ATP Challenger Series is the second tier tour for professional tennis organised by the Association of Tennis Professionals (ATP). The 2001 ATP Challenger Series calendar comprised 135 tournaments, with prize money ranging from $25,000 up to $125,000.[1][2]