The 1991 Geneva Open was a men's tennis tournament played on clay courts that was part of the World Series of the 1991 ATP Tour. It was the 12th edition of the tournament and was played at Geneva, Switzerland from 9 September through 16 September 1991. Unseeded Thomas Muster won the singles title.[1]
See main article: 1991 Geneva Open – Singles. Thomas Muster defeated Horst Skoff 6–2, 6–4
See main article: 1991 Geneva Open – Doubles. Sergi Bruguera / Marc Rosset defeated Per Henricsson / Ola Jonsson 3–6, 6–3, 6–2