2001 UBS Open – Singles
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Àlex Corretja was the defending champion but lost in the semifinals to Jiří Novák.
Novák won in the final 6–1, 6–7(5–7), 7–5 against Juan Carlos Ferrero.
Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
- Russia Marat Safin (first round)
- Spain Juan Carlos Ferrero (final)
- France Sébastien Grosjean (semifinals)
- Spain Àlex Corretja (semifinals)
- Switzerland Roger Federer (first round)
- Argentina Franco Squillari (quarterfinals)
- Argentina Guillermo Coria (first round)
- Morocco Hicham Arazi (first round)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted