| 6 Feb | ABN World Tennis Tournament
Rotterdam, The Netherlands
Super Series
Carpet – $325,000 – 32S/16D
ABN World Tennis Tournament – Singles|Singles] – 1989 ABN [World Tennis Tournament – Doubles|Doubles] |  March| Week | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | | 6 Mar | Eagle Classic (WCT)
Scottsdale, Arizona, United States
Super Series
Hard – $297,500 – 32S/16D
Singles – Doubles |  April| Week | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | | 3 Apr | Davis Cup: Quarterfinals
Vienna, Austria – clay
Split, Croatia, Yugoslavia – carpet
San Diego, California, United States – carpet
Prague, Czechoslovakia – carpet | Quarterfinal winners 3–2
4–1
5–0
3–2 | Quarterfinal losers
| | | | 10 Apr | 1989 [Seoul Open|Seoul Open]
Seoul, South Korea
Hard – $93,400 – 32S/16D
Seoul Open – Singles|Singles] – Doubles |  May| Week | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | | 1 May | Eagle Tournament of Champions (WCT)
Forest Hills, New York, United States
Clay – $485,000 – 56S/28D
1989 [Eagle Tournament of Champions – Singles|Singles] – Doubles | June| Week | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | | 12 Jun | 1989 [Stella Artois Championships|Stella Artois Championships]
London, Great Britain
Grass – $350,000 – 64S/32D
Stella Artois Championships – Singles|Singles] – Doubles | July| Week | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | | 10 Jul | Shawmut US Pro Championships
Boston, United States
Super Series
Clay – $297,500 – 56S/28D
Singles – Doubles |  August| Week | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | | 7 Aug | Swiss Army Knife Open
Livingston, New Jersey, United States
Hard – $93,400 – 32S/16D
1989 [Livingston Open – Singles|Singles] – Doubles | SeptemberOctober| Week | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists | | 2 Oct | Queensland Open
Brisbane, Australia
Hard – $150,000 – 32S/16D |  NovemberDecemberRankingsGrand PrixATPList of tournament winnersList of players and Grand Prix singles titles won, alphabetically by last name:
- Andre Agassi – Orlando
- Ronald Agénor – Athens
- Juan Aguilera – Bari
- José Francisco Altur – San Marino
- Paul Annacone – Vienna
- Boris Becker – Milan, Philadelphia, Wimbledon, US Open, Paris Bercy
- Jay Berger – Charleston
- Paolo Canè – Båstad
- Michael Chang – French Open, Wembley
- Andrei Chesnokov – Nice, Munich
- Jimmy Connors – Toulouse, Tel Aviv
- Jim Courier – Basel
- Kevin Curren – Frankfurt
- Franco Davín – St. Vincent
- Horacio de la Peña – Florence
- Stefan Edberg – Tokyo, Season-Ending Championships
- Kelly Evernden – Wellington
- Marcelo Filippini – Prague
- Guy Forget – Nancy
- Brad Gilbert – Memphis, Stratton Mountain, Livingston, Cincinnati, San Francisco
- Andrés Gómez – Boston, Barcelona
- Jakob Hlasek – Rotterdam
- Martín Jaite – Stuttgart, Madrid, São Paulo, Itaparica
- Eric Jelen – Bristol
- Kelly Jones – Singapore City
- Aaron Krickstein – Sydney, Los Angeles, Tokyo Indoors
- Ramesh Krishnan – Auckland
- Niclas Kroon – Brisbane
- Ivan Lendl – Australian Open, Scottsdale, Miami, Forest Hills, Hamburg, London, Canada, Bordeaux, Sydney Indoors, Stockholm
- Alberto Mancini – Monte Carlo, Rome
- Luiz Mattar – Guarujá, Rio de Janeiro
- Tim Mayotte – Washington, D.C.
- John McEnroe – Lyon, Dallas, Indianapolis
- Miloslav Mečíř – Indian Wells
- Karel Nováček – Hilversum
- Guillermo Pérez Roldán – Palermo
- Jim Pugh – Newport
- Marc Rosset – Geneva
- Emilio Sánchez – Kitzbühel
- Javier Sánchez – Bologna
- Carl-Uwe Steeb – Gstaad
- Robert Van't Hof – Seoul
- Christo van Rensburg – Johannesburg
- Mark Woodforde – Adelaide
- Simon Youl – Schenectady
The following players won their first career title:
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