# 1988 Donnay Indoor Championships – Singles

Mats Wilander was the defending champion, but did not participate this year.
Henri Leconte won the title, defeating Jakob Hlasek 7–6$^{(7–3)}$, 7–6$^{(8–6)}$, 6–4 in the final.

## Seeds

* Henri Leconte (champion)
* Jakob Hlasek (final)
* Jonas Svensson (first round)
* John Fitzgerald (semifinals)
* Ronald Agénor (second round)
* Milan Šrejber (second round)
* Magnus Gustafsson (first round)
* Wally Masur (quarterfinals)

## 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 | Final |
| 1 | Henri Leconte | 6 | 2 | 6 | | | | | |
| 4 | John Fitzgerald | 4 | 6 | 2 | | | | | |
| 4 | John Fitzgerald | 4 | 6 | 2 | 1 | Henri Leconte | 7 | 7 | 6 |
| | | | | | 2 | Jakob Hlasek | 6 | 6 | 4 |
| | Patrik Kühnen | 6 | 0$^r$ | | 2 | Jakob Hlasek | 6 | 6 | 4 |
| 2 | Jakob Hlasek | 7 | 3 | | | | | | |

### 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 | Semifinals |
| 1 | H Leconte | 7 | 6 | | | | | | | | | | | | | | | | |
| | D Nargiso | 6 | 2 | | 1 | H Leconte | 6 | 6 | | | | | | | | | | | |
| | E Masso | 6 | 6 | 7 | | E Masso | 3 | 4 | | | | | | | | | | | |
| | T Šmid | 7 | 3 | 6 | | | | | | 1 | H Leconte | 6 | 1 | 6 | | | | | |
| Q | J Vekemans | 3 | 6 | | | | | | | 8 | W Masur | 4 | 6 | 3 | | | | | |
| | M Westphal | 6 | 7 | | | M Westphal | 2 | 7 | 4 | | | | | | | | | | |
| | M Vajda | 7 | 4 | 0 | 8 | W Masur | 6 | 5 | 6 | | | | | | | | | | |
| 8 | W Masur | 6 | 6 | 6 | | | | | | | | | | | 1 | H Leconte | 6 | 2 | 6 |
| 4 | J Fitzgerald | 6 | 6 | | | | | | | | | | | | 4 | J Fitzgerald | 4 | 6 | 2 |
| | L Pimek | 3 | 4 | | 4 | J Fitzgerald | 6 | 6 | | | | | | | | | | | |
| Q | X Daufresne | 1 | 2 | | Q | K Demuynck | 4 | 4 | | | | | | | | | | | |
| Q | K Demuynck | 6 | 6 | | | | | | | 4 | J Fitzgerald | 6 | 3 | 6 | | | | | |
| WC | B Wuyts | 3 | 4 | | | | | | | | E Jelen | 1 | 6 | 0 | | | | | |
| | E Jelen | 6 | 6 | | | E Jelen | 4 | 6 | 7 | | | | | | | | | | |
| | M Oosting | 3 | 3 | | 5 | R Agénor | 6 | 4 | 5 | | | | | | | | | | |
| 5 | R Agénor | 6 | 6 | | | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | M Šrejber | 6 | 6 | | | | | | | | | | | | | | |
| LL | G Vanderveeren | 4 | 4 | | 6 | M Šrejber | 4 | 6 | 6 | | | | | | | | |
| | É Winogradsky | 6 | 6 | | | É Winogradsky | 6 | 3 | 7 | | | | | | | | |
| | D Cassidy | 4 | 4 | | | | | | | | É Winogradsky | 4 | 2 | | | | |
| | J Potier | 6 | 4 | | | | | | | | P Kühnen | 6 | 6 | | | | |
| | P Kühnen | 7 | 6 | | | P Kühnen | 6 | 7 | | | | | | | | | |
| | C Saceanu | 6 | 7 | | | C Saceanu | 3 | 6 | | | | | | | | | |
| 3 | J Svensson | 2 | 5 | | | | | | | | | | | | P Kühnen | 6 | 0$^r$ |
| 7 | M Gustafsson | 6 | 3 | | | | | | | | | | | 2 | J Hlasek | 7 | 3 |
| Q | R Barlow | 7 | 6 | | Q | R Barlow | 3 | 0 | | | | | | | | | |
| | T Nijssen | 6 | 6 | | | T Nijssen | 6 | 6 | | | | | | | | | |
| WC | M Bahrami | 3 | 3 | | | | | | | | T Nijssen | 5 | 4 | | | | |
| | A Boetsch | 7 | 1 | 4 | | | | | | 2 | J Hlasek | 7 | 6 | | | | |
| | G Layendecker | 6 | 6 | 6 | | G Layendecker | 6 | 6 | 4 | | | | | | | | |
| | A Tous | 1 | 5 | | 2 | J Hlasek | 4 | 7 | 6 | | | | | | | | |
| 2 | J Hlasek | 6 | 7 | | | | | | | | | | | | | | |