# 1989 Porsche Tennis Grand Prix – Singles

Martina Navratilova was the three-time defending champion, but did not compete this year.
Gabriela Sabatini won the title by defeating Mary Joe Fernández 7–6$^{(7–5)}$, 6–4 in the final. As a result, Sabatini won a Porsche 944 S2 for winning the tournament.

## Seeds

* Gabriela Sabatini (champion)
* Zina Garrison (semifinals)
* Helena Suková (first round)
* Monica Seles (quarterfinals)
* Mary Joe Fernández (final)
* Hana Mandlíková (quarterfinals)
* Raffaella Reggi (second round)
* Barbara Paulus (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Gabriela Sabatini | 6 | 6 | | | | | |
| | Laura Gildemeister | 1 | 2 | | | | | |
| | Laura Gildemeister | 1 | 2 | | 1 | Gabriela Sabatini | 7$^7$ | 6 |
| | | | | | 5 | Mary Joe Fernández | 6$^5$ | 4 |
| 5 | Mary Joe Fernández | 3 | 6 | 7 | 5 | Mary Joe Fernández | 6$^5$ | 4 |
| 2 | Zina Garrison | 6 | 4 | 5 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | G Sabatini | 6 | 6 | | | | | | | | | | | | | | | |
| | N Tauziat | 2 | 1 | | 1 | G Sabatini | 6 | 6 | | | | | | | | | | |
| Q | E Derly | 5 | 7$^7$ | 0 | | C Dahlman | 2 | 0 | | | | | | | | | | |
| | C Dahlman | 7 | 6$^4$ | 6 | | | | | | 1 | G Sabatini | 6 | 6 | | | | | |
| | C Tanvier | 6 | 6 | | | | | | | 6 | H Mandlikova | 3 | 0 | | | | | |
| WC | E Pfaff | 0 | 1 | | | C Tanvier | 5 | 6 | 4 | | | | | | | | | |
| | K Quentrec | 4 | 3 | | 6 | H Mandlikova | 7 | 4 | 6 | | | | | | | | | |
| 6 | H Mandlikova | 6 | 6 | | | | | | | | | | | | 1 | G Sabatini | 6 | 6 |
| 3 | H Suková | 3 | 2 | | | | | | | | | | | | | L Gildemeister | 1 | 2 |
| | R Zrubáková | 6 | 6 | | | R Zrubáková | 7$^7$ | 2 | 6 | | | | | | | | | |
| | R Rajchrtová | 7 | 1 | 2 | | R White | 6$^4$ | 6 | 1 | | | | | | | | | |
| | R White | 5 | 6 | 6 | | | | | | | R Zrubáková | 4 | 6 | 5 | | | | |
| | M Paz | 1 | 4 | | | | | | | | L Gildemeister | 6 | 2 | 7 | | | | |
| | J Wiesner | 6 | 6 | | | J Wiesner | 2 | 6 | 5 | | | | | | | | | |
| | L Gildemeister | 6 | 6 | | | L Gildemeister | 6 | 1 | 7 | | | | | | | | | |
| 8 | B Paulus | 4 | 2 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | MJ Fernández | 6 | 6 | | | | | | | | | | | | | | | | |
| Q | P Etchemendy | 4 | 2 | | 5 | MJ Fernández | 6 | 6 | | | | | | | | | | | |
| | S Wasserman | 6 | 6 | | | S Wasserman | 1 | 0 | | | | | | | | | | | |
| | P Tarabini | 2 | 2 | | | | | | | 5 | MJ Fernández | 6 | 4 | 7$^7$ | | | | | |
| | S Hanika | 6 | 4 | 7$^7$ | | | | | | 4 | M Seles | 4 | 6 | 6$^5$ | | | | | |
| | L McNeil | 2 | 6 | 6$^4$ | | S Hanika | 3 | 4 | | | | | | | | | | | |
| | B Schultz | 6 | 3 | 4 | 4 | M Seles | 6 | 6 | | | | | | | | | | | |
| 4 | M Seles | 4 | 6 | 6 | | | | | | | | | | | 5 | MJ Fernández | 3 | 6 | 7 |
| 7 | R Reggi | 6 | 6 | | | | | | | | | | | | 2 | Z Garrison | 6 | 4 | 5 |
| Q | W Probst | 2 | 0 | | 7 | R Reggi | 1 | 3 | | | | | | | | | | | |
| | G Fernández | 6 | 6 | | | G Fernández | 6 | 6 | | | | | | | | | | | |
| | A Henricksson | 3 | 3 | | | | | | | | G Fernández | 4 | 2 | | | | | | |
| Q | D Van Rensburg | 7 | 6 | | | | | | | 2 | Z Garrison | 6 | 6 | | | | | | |
| WC | C Porwik | 5 | 3 | | Q | D Van Rensburg | 6 | 1 | 1 | | | | | | | | | | |
| | E Reinach | 4 | 1 | | 2 | Z Garrison | 2 | 6 | 6 | | | | | | | | | | |
| 2 | Z Garrison | 6 | 6 | | | | | | | | | | | | | | | | |