# 2001 Gerry Weber Open – Singles

David Prinosil was the defending champion but lost in the second round to Roger Federer.
Thomas Johansson won in the final 6–3, 6–7$^{(5–7)}$, 6–2 against Fabrice Santoro.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Yevgeny Kafelnikov (semifinals)
* Patrick Rafter (semifinals)
* Sébastien Grosjean (second round)
* Arnaud Clément (first round)
* Àlex Corretja (first round)
* Roger Federer (quarterfinals)
* Thomas Johansson (champion)
* Tommy Haas (second 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 |
| 1 | Yevgeny Kafelnikov | 3 | 6 | 2 | | | | | |
| 7 | Thomas Johansson | 6 | 5 | 6 | | | | | |
| 7 | Thomas Johansson | 6 | 5 | 6 | 7 | Thomas Johansson | 6 | 6$^5$ | 6 |
| | | | | | | Fabrice Santoro | 3 | 7$^7$ | 2 |
| | Fabrice Santoro | 7 | 6 | | | Fabrice Santoro | 3 | 7$^7$ | 2 |
| 2 | Patrick Rafter | 5 | 4 | | | | | | |

### 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 | Y Kafelnikov | 6 | 4 | 6 | | | | | | | | | | | | | | | |
| Q | T Ketola | 3 | 6 | 2 | 1 | Y Kafelnikov | 6 | 6 | | | | | | | | | | | |
| | R Schüttler | 6 | 6 | | | R Schüttler | 4 | 4 | | | | | | | | | | | |
| | N Lapentti | 4 | 4 | | | | | | | 1 | Y Kafelnikov | 6$^2$ | 7$^7$ | 7$^7$ | | | | | |
| | N Escudé | 6 | 6 | | | | | | | | N Escudé | 7$^7$ | 6$^3$ | 6$^4$ | | | | | |
| Q | D Nestor | 1 | 2 | | | N Escudé | 6 | 6 | | | | | | | | | | | |
| | M Mirnyi | 4 | 4 | | 8 | T Haas | 3 | 4 | | | | | | | | | | | |
| 8 | T Haas | 6 | 6 | | | | | | | | | | | | 1 | Y Kafelnikov | 3 | 7 | 2 |
| 4 | A Clément | 3 | 4 | | | | | | | | | | | | 7 | T Johansson | 6 | 5 | 6 |
| | N Kiefer | 6 | 6 | | | N Kiefer | 6$^3$ | 7$^7$ | 6$^1$ | | | | | | | | | | |
| | S Schalken | 1 | 4 | | | J Björkman | 7$^7$ | 6$^4$ | 7$^7$ | | | | | | | | | | |
| | J Björkman | 6 | 6 | | | | | | | | J Björkman | 4 | 2 | | | | | | |
| | Á Calatrava | 6$^5$ | 4 | | | | | | | 7 | T Johansson | 6 | 6 | | | | | | |
| | M Larsson | 7$^7$ | 6 | | | M Larsson | 5 | 5 | | | | | | | | | | | |
| | M Chang | 2 | 5 | | 7 | T Johansson | 7 | 7 | | | | | | | | | | | |
| 7 | T Johansson | 6 | 7 | | | | | | | | | | | | | | | | |

### 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 |
| 5 | À Corretja | 0 | 2 | | | | | | | | | | | | | | | |
| | J Golmard | 6 | 6 | | | J Golmard | 6 | 4 | 5 | | | | | | | | | |
| Q | C Saulnier | 6$^2$ | 2 | | WC | L Burgsmüller | 4 | 6 | 7 | | | | | | | | | |
| WC | L Burgsmüller | 7$^7$ | 6 | | | | | | | WC | L Burgsmüller | 6$^3$ | 4 | | | | | |
| WC | A Popp | 2 | 3 | | | | | | | | F Santoro | 7$^7$ | 6 | | | | | |
| | F Santoro | 6 | 6 | | | F Santoro | 7 | 7 | | | | | | | | | | |
| Q | W Black | 7 | 3 | 1 | 3 | S Grosjean | 5 | 5 | | | | | | | | | | |
| 3 | S Grosjean | 5 | 6 | 6 | | | | | | | | | | | | F Santoro | 7 | 6 |
| 6 | R Federer | 6$^4$ | 6 | 6 | | | | | | | | | | | 2 | P Rafter | 5 | 4 |
| | A Portas | 7$^7$ | 4 | 2 | 6 | R Federer | 7$^{10}$ | 7 | | | | | | | | | | |
| | D Prinosil | 7$^7$ | 7$^7$ | | | D Prinosil | 6$^8$ | 5 | | | | | | | | | | |
| WC | C Moyá | 6$^5$ | 6$^4$ | | | | | | | 6 | R Federer | 6 | 6$^6$ | 6$^4$ | | | | |
| | A Pavel | 6 | 6 | | | | | | | 2 | P Rafter | 4 | 7$^8$ | 7$^7$ | | | | |
| | B Ulihrach | 1 | 3 | | | A Pavel | 3 | 3 | | | | | | | | | | |
| | D Vacek | 3 | 4 | | 2 | P Rafter | 6 | 6 | | | | | | | | | | |
| 2 | P Rafter | 6 | 6 | | | | | | | | | | | | | | | |