| 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]
| Week of | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | 
|---|---|---|---|---|---|
| January 1 | No tournaments scheduled. | ||||
| January 8 | No tournaments scheduled. | ||||
| January 15 | Jakarta-1 Challenger  Jakarta, Indonesia $25,000 – clay – 32S/16D Singles draw – Doubles draw |  Horst Skoff 6–2, 4–6, 6–1 |  Chris Garner |  Brian Devening  Kim Bong-soo |  Yoo Jin-Sun  Xavier Daufresne  Pablo Arraya  Thomas Buchmayer | 
|  Eric Amend  Tom Mercer 6–4, 6–7, 6–3 |  Adam Malik  Joseph Russell | ||||
| January 22 | Intersport Heilbronn Open  Heilbronn, West Germany $50,000 – carpet (I) – 32S/16D Singles draw – Doubles draw |  Milan Šrejber 7–6, 4–6, 7–6 |  Alexander Mronz |  Christian Saceanu  Jeff Tarango |  Mark Kaplan  Olivier Soules  Martin Sinner  Jörgen Windahl | 
|  David Rikl  Tomáš Anzari 7–6, 7–6 |  Byron Talbot  Jörgen Windahl | ||||
| January 29 | No tournaments scheduled. | ||||
| Week of | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | 
|---|---|---|---|---|---|
| June 4 | No tournaments scheduled. | ||||
| June 11 | No tournaments scheduled. | ||||
| June 18 | No tournaments scheduled. | ||||
| June 25 | Turin Challenger  Turin, Italy $50,000 – clay – 32S/16D Singles draw – Doubles draw |  João Cunha e Silva 7–6, 6–7, 6–4 |  Jimmy Brown |  Gabriel Markus  Marcos Górriz |  Bernd Karbacher  Bart Wuyts  Renzo Furlan  Pablo Arraya | 
|  Neil Borwick  David Lewis 6–2, 3–6, 6–2 |  Christer Allgårdh  Martin Sinner | ||||
| Week of | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | 
|---|---|---|---|---|---|
| December 3 | Guam Challenger  Guam, Guam $25,000 – hard – 32S/16D Singles draw – Doubles draw |  Jamie Morgan 6–2, 7–6 |  Chuck Adams |  Glenn Michibata  Steve DeVries |  Francisco Montana  Andrew Castle  Matt Anger  Mike Briggs | 
|  Steve DeVries  Ted Scherman 6–1, 3–6, 7–6 |  Matt Anger  Andrew Castle | ||||
| December 10 | No tournaments scheduled. | ||||
| December 17 | Hong Kong Challenger  Hong Kong $25,000 – hard – 32S/16D Singles draw – Doubles draw |  Christian Saceanu 6–4, 6–1 |  Felix Barrientos |  Gianluca Pozzi  Jamie Morgan |  Chuck Adams  Christian Geyer  Bruce Steel  David Engel | 
|  Neil Borwick  Paul Wekesa 6–2, 6–2 |  Christian Geyer  Christian Saceanu | ||||
These tables present the number of singles (S) and doubles (D) titles won by each player and each nation during the season, within all the tournament categories of the 1990 ATP Challenger Series. 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).
| Total | Nation | S | D | 
|---|---|---|---|
| 19 |  United States  (USA) | 5 | 14 | 
| 13 |  West Germany  (FRG) | 9 | 4 | 
| 12 |  Sweden  (SWE) | 5 | 7 | 
| 11 |  Argentina  (ARG) | 4 | 7 | 
| 10 |  France  (FRA) | 7 | 3 | 
| 10 |  Spain  (ESP) | 4 | 6 | 
| 10 |  Netherlands  (NED) | 3 | 7 | 
| 10 |  Czechoslovakia  (TCH) | 2 | 8 | 
| 9 |  Brazil  (BRA) | 4 | 5 | 
| 8 |  Australia  (AUS) | 2 | 6 | 
| 6 |  New Zealand  (NZL) | 1 | 5 | 
| 5 |  Austria  (AUT) | 4 | 1 | 
| 5 |  Italy  (ITA) | 3 | 2 | 
| 5 |  South Africa  (RSA) | 1 | 4 | 
| 5 |  Soviet Union  (URS) | 1 | 4 | 
| 4 |  Mexico  (MEX) | 3 | 1 | 
| 4 |  Great Britain  (GBR) | 1 | 3 | 
| 3 |  Chile  (CHI) | 3 | 0 | 
| 3 |  Portugal  (POR) | 2 | 1 | 
| 2 |  Colombia  (COL) | 1 | 1 | 
| 2 |  India  (IND) | 1 | 1 | 
| 2 |  Israel  (ISR) | 1 | 1 | 
| 2 |  Nigeria  (NGR) | 1 | 1 | 
| 2 |  Bahamas  (BAH) | 1 | 1 | 
| 2 |  Belgium  (BEL) | 0 | 2 | 
| 2 |  Kenya  (KEN) | 0 | 2 | 
| 1 |  Puerto Rico  (PUR) | 1 | 0 | 
| 1 |  Uruguay  (URU) | 1 | 0 | 
| 1 |  Yugoslavia  (YUG) | 1 | 0 | 
| 1 |  Canada  (CAN) | 0 | 1 | 
| 1 |  Finland  (FIN) | 0 | 1 | 
| 1 |  Iran  (IRN) | 0 | 1 | 
| 1 |  Venezuela  (VEN) | 0 | 1 |