| Details | |
|---|---|
| Duration | 15 January 1990 – 23 December 1990 |
| Edition | 13th |
| Tournaments | 71 |
| Achievements (singles) | |
← 1989 1991 → | |
The ATP Challenger Series is the second-tier tour for professional tennis organised by the Association of Tennis Professionals (ATP). The 1990 ATP Challenger Series calendar comprises 71 tournaments, with prize money ranging from $25,000 up to $100,000.[1]