The 1990 Swiss Indoors was a men's tennis tournament played on indoor hard courts at the St. Jakobshalle in Basel, Switzerland that was part of the World Series of the 1990 ATP Tour. It was the 21st edition of the tournament and took place from 24 September until 30 September 1990. Third-seeded John McEnroe won the singles title.[1]
See main article: 1990 Swiss Indoors – Singles. 
John McEnroe defeated Goran Ivanišević 6–7(4–7), 4–6, 7–6(7–3), 6–3, 6–4
See main article: 1990 Swiss Indoors – Doubles. Stefan Kruger / Christo van Rensburg defeated 
Neil Broad / Gary Muller 4–6, 7–6, 6–3