| Singles | |
|---|---|
| 1989 CA-TennisTrophy | |
| Champion |  Paul Annacone |
| Runner-up |  Kelly Evernden |
| Final score | 6–7, 6–4, 6–1, 2–6, 6–3 |
| Draw | 32 |
| Seeds | 8 |
Horst Skoff was the defending champion but lost in the second round to Glenn Layendecker.
Paul Annacone won in the final 6–7, 6–4, 6–1, 2–6, 6–3 against Kelly Evernden.
Jay Berger (Quarterfinals)
Thomas Muster (Semifinals) Horst Skoff (Second Round)
Paolo Canè (Second Round)
Goran Prpić (Second Round)
Jordi Arrese (First Round)
Anders Järryd (Quarterfinals) Goran Ivanišević (First Round)| Semifinals | Final | ||||||||||||||
| Q |  Petr Korda | 1 | 6 | ||||||||||||
| Paul Annacone | 6 | 7 | |||||||||||||
| Paul Annacone | 6 | 6 | 6 | 2 | 6 | ||||||||||
| Kelly Evernden | 7 | 4 | 1 | 6 | 3 | ||||||||||
| Kelly Evernden | 4 | 6 | 6 | ||||||||||||
| 2 | Thomas Muster | 6 | 2 | 3 | |||||||||||
| First Round | Second Round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Berger | 6 | 3 | 6 | |||||||||||||||||||||||
| Q | J Canter | 2 | 6 | 1 | 1 | J Berger | 6 | 6 | |||||||||||||||||||
 A Cherkasov | 4 | 6 | 6 | Q |  C Geyer | 3 | 2 | ||||||||||||||||||||
| Q | C Geyer | 6 | 3 | 7 | 1 | J Berger | 6 | 6 | 3 | ||||||||||||||||||
| Q | P Korda | 6 | 7 | Q | P Korda | 3 | 7 | 6 | |||||||||||||||||||
| M Šrejber | 4 | 6 | Q | P Korda | 6 | 5 | 6 | ||||||||||||||||||||
 M Schapers | 6 | 7 | M Schapers | 4 | 7 | 4 | |||||||||||||||||||||
| 8 | G Ivanišević | 3 | 6 | Q | P Korda | 1 | 6 | ||||||||||||||||||||
| 3 | H Skoff | 7 | 6 | P Annacone | 6 | 7 | |||||||||||||||||||||
| Q | J Navrátil | 5 | 4 | 3 | H Skoff | 2 | 4 | ||||||||||||||||||||
| WC | M Oberleitner | 3 | 6 | G Layendecker | 6 | 6 | |||||||||||||||||||||
| G Layendecker | 6 | 7 | G Layendecker | 3 | 6 | ||||||||||||||||||||||
| J Gunnarsson | 2 | 6 | 6 | P Annacone | 6 | 7 | |||||||||||||||||||||
| A Antonitsch | 6 | 3 | 4 | J Gunnarsson | 1 | 5 | |||||||||||||||||||||
| P Annacone | 6 | 6 | P Annacone | 6 | 7 | ||||||||||||||||||||||
| 6 | J Arrese | 4 | 2 | ||||||||||||||||||||||||
| First Round | Second Round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | G Prpić | 6 | 6 | ||||||||||||||||||||||||
| B Orešar | 3 | 4 | 5 | G Prpić | 6 | 7 | 3 | ||||||||||||||||||||
| A Volkov | 7 | 6 | A Volkov | 7 | 5 | 6 | |||||||||||||||||||||
| M Stich | 5 | 2 | A Volkov | 5 | 6 | 5 | |||||||||||||||||||||
| K Evernden | 6 | 6 | K Evernden | 7 | 4 | 7 | |||||||||||||||||||||
 N Pereira | 4 | 1 | K Evernden | 6 | 6 | ||||||||||||||||||||||
| D Nargiso | 3 | 4 | 4 | P Canè | 4 | 3 | |||||||||||||||||||||
| 4 | P Canè | 6 | 6 | K Evernden | 4 | 6 | 6 | ||||||||||||||||||||
| 7 | A Järryd | 7 | 6 | 2 | T Muster | 6 | 2 | 3 | |||||||||||||||||||
| C Bergström | 5 | 1 | 7 | A Järryd | 2 | 6 | 6 | ||||||||||||||||||||
| O Camporese | 4 | 4 | M Vajda | 6 | 0 | 3 | |||||||||||||||||||||
| M Vajda | 6 | 6 | 7 | A Järryd | 4 | 4 | |||||||||||||||||||||
| LL | R Osterthun | 4 | 2 | 2 | T Muster | 6 | 6 | ||||||||||||||||||||
| WC | T Buchmayer | 6 | 6 | WC | T Buchmayer | 4 | 2 | ||||||||||||||||||||
| WC | M Bauer | 4 | 2 | 2 | T Muster | 6 | 6 | ||||||||||||||||||||
| 2 | T Muster | 6 | 6 | ||||||||||||||||||||||||
Goran Ivanišević defeated Pete Sampras 6–4, 6–4 in the final to secure the title.
Nicklas Kulti was the defending champion, but lost in the first round this year.
MaliVai Washington was the defending champion, but lost in the first round this year.
Andrei Chesnokov was the defending champion, but did not participate this year.
Guillermo Pérez Roldán was the defending champion.
Miloslav Mečíř was the defending champion, but lost in the first round to Richey Reneberg.
Ivan Lendl was the defending champion, but lost in the fourth round to Emilio Sanchez.
Paul Annacone was the defending champion but lost in the second round to Thomas Muster.
Anders Järryd was the defending champion of the singles event at the CA-TennisTrophy tennis tournament but lost in the quarterfinals to Michael Stich.
Francisco Clavet was the defending champion of the singles event at the Dutch Open men's tennis tournament, but he lost to Magnus Gustafsson.
Boris Becker was the defending champion but lost in the third round to Jan Gunnarsson.
Sergio Casal and Emilio Sánchez were the defending champions but lost in the second round to Marcelo Filippini and Horst Skoff.
Henri Leconte was the defending champion but lost in the second round to Goran Ivanišević.
The 1990 Diet Pepsi Championships was a tennis tournament played on indoor carpet courts at the Wembley Arena in Wembley, London, England. Michael Chang was the defending champion, but he lost the final to Jakob Hlasek, 7–6, 6–3.
Jim Courier was the defending champion, but lost in the semifinals to Michael Chang.
Marc Rosset was the defending champion, but lost in the semifinals this year.
Horst Skoff was the defending champion, but lost in the final this year.
Andre Agassi was the defending champion, but lost in the fourth round to David Wheaton.
Emilio Sánchez was the defending champion, but lost in the second round to Francisco Roig.
Thomas Muster was the defending champion, but lost in the semifinals to Fabrice Santoro.