The 1991 CA-TennisTrophy was a men's tennis tournament played on indoor carpet courts at the Wiener Stadthalle in Vienna in Austria and was part of the World Series of the 1991 ATP Tour. It was the 17th edition of the tournament and was held from 14 October through 21 October 1991. First-seeded Michael Stich won the singles title.[3]
Finals
Singles
Michael Stich defeated 
Jan Siemerink 6–4, 6–4, 6–4
- It was Stich's 4th singles title of the year and the 5th of his career.
Doubles
Anders Järryd / 
Gary Muller defeated 
Jakob Hlasek / 
Patrick McEnroe 6–4, 7–5
- It was Järryd's 5th title of the year and the 52nd of his career. It was Muller's 2nd title of the year and the 5th of his career.
References
- ^ "1991 Vienna – Singles draw". Association of Tennis Professionals (ATP).
- ^ "1991 Vienna – Doubles draw". Association of Tennis Professionals (ATP).
- ^ John Barrett, ed. (1992). The International Tennis Federation World of Tennis 1992. London: CollinsWillow. pp. 119, 141. ISBN 9780002184304.