# 1990 Swiss Indoors – Singles

Jim Courier was the defending champion, but lost in the second round to Andrei Cherkasov.
Third-seeded John McEnroe won the title by defeating Goran Ivanišević 6–7$^{(4–7)}$, 4–6, 7–6$^{(7–3)}$, 6–3, 6–4 in the final.

## Seeds

* Andrés Gómez (first round)
* Goran Ivanišević (final)
* John McEnroe (champion)
* Andrei Chesnokov (second round)
* Jim Courier (second round)
* Magnus Gustafsson (quarterfinals)
* Karel Nováček (second round)
* Marc Rosset (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 | Final | Final | Final |
| Q | Scott Melville | 2 | 6 | 3 | | | | | | | |
| 3 | John McEnroe | 6 | 2 | 6 | | | | | | | |
| 3 | John McEnroe | 6 | 2 | 6 | 3 | John McEnroe | 6$^4$ | 4 | 7$^7$ | 6 | 6 |
| | | | | | 2/WC | Goran Ivanišević | 7$^7$ | 6 | 6$^3$ | 3 | 4 |
| | Veli Paloheimo | 2 | 4 | | 2/WC | Goran Ivanišević | 7$^7$ | 6 | 6$^3$ | 3 | 4 |
| 2/WC | Goran Ivanišević | 6 | 6 | | | | | | | | |

### 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 | A Gómez | 6 | 6 | | | | | | | | | | | | | | | | |
| | JP Fleurian | 7 | 7 | | | JP Fleurian | 4 | 6 | | | | | | | | | | | |
| Q | S Melville | 7 | 6 | | Q | S Melville | 6 | 7 | | | | | | | | | | | |
| Q | F Dennhardt | 5 | 4 | | | | | | | Q | S Melville | 7 | 6 | 6 | | | | | |
| | A Rahunen | 6 | 6 | 4 | | | | | | | Y Noah | 6 | 7 | 4 | | | | | |
| | Y Noah | 4 | 7 | 6 | | Y Noah | 6 | 6 | | | | | | | | | | | |
| WC | M Bahrami | 6 | 5 | 7 | WC | M Bahrami | 3 | 3 | | | | | | | | | | | |
| 8 | M Rosset | 1 | 7 | 6 | | | | | | | | | | | Q | S Melville | 2 | 6 | 3 |
| 3 | J McEnroe | 6 | 6 | | | | | | | | | | | | 3 | J McEnroe | 6 | 2 | 6 |
| | M Šrejber | 4 | 3 | | 3 | J McEnroe | 6 | 6 | | | | | | | | | | | |
| WC | N Kulti | 6 | 6 | | WC | N Kulti | 1 | 2 | | | | | | | | | | | |
| Q | C Bergström | 4 | 4 | | | | | | | 3 | J McEnroe | 6 | 7 | | | | | | |
| | M Larsson | 4 | 1 | | | | | | | | A Cherkasov | 3 | 5 | | | | | | |
| | A Cherkasov | 6 | 6 | | | A Cherkasov | 3 | 6 | 6 | | | | | | | | | | |
| | A Mansdorf | 6 | 0 | | 5 | J Courier | 6 | 2 | 3 | | | | | | | | | | |
| 5 | J Courier | 7 | 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 Gustafsson | 6 | 4 | 6 | | | | | | | | | | | | | |
| | R Agénor | 1 | 6 | 3 | 6 | M Gustafsson | 6 | 7 | 6 | | | | | | | | |
| Q | J Gunnarsson | 4 | 6 | 4 | | L Mattar | 7 | 6 | 4 | | | | | | | | |
| | L Mattar | 6 | 4 | 6 | | | | | | 6 | M Gustafsson | 6 | 4 | | | | |
| | M Filippini | 2 | 7 | 3 | | | | | | | V Paloheimo | 7 | 6 | | | | |
| | V Paloheimo | 6 | 5 | 6 | | V Paloheimo | 2 | 6 | 7 | | | | | | | | |
| | G Muller | 4 | 6 | | 4 | A Chesnokov | 6 | 2 | 5 | | | | | | | | |
| 4 | A Chesnokov | 6 | 7 | | | | | | | | | | | | V Paloheimo | 2 | 4 |
| 7 | K Nováček | 6 | 7 | | | | | | | | | | | 2/WC | G Ivanišević | 6 | 6 |
| | C van Rensburg | 0 | 5 | | 7 | K Nováček | 2 | 3 | | | | | | | | | |
| | J Connors | 6 | 3 | | | M Stich | 6 | 6 | | | | | | | | | |
| | M Stich | 7 | 6 | | | | | | | | M Stich | 6 | 6 | | | | |
| | P Korda | 7 | 3 | 6 | | | | | | 2/WC | G Ivanišević | 7 | 7 | | | | |
| | J Yzaga | 6 | 6 | 3 | | P Korda | 1 | 2 | | | | | | | | | |
| | A Volkov | 6 | 1 | | 2/WC | G Ivanišević | 6 | 6 | | | | | | | | | |
| 2/WC | G Ivanišević | 7 | 6 | | | | | | | | | | | | | | |