Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The 1983 Cologne Cup, also known as the European Indoor Championships, was a men's tennis tournament played on indoor carpet courts in Cologne, West Germany that was part of the 1983 Volvo Grand Prix circuit. It was the eighth edition of the tournament and was held from 24 October through 30 October 1983. Unseeded Matt Doyle won the singles title.
Matt Doyle
Nick Saviano / 
Florin Segărceanu
Hans-Dieter Beutel 1–6, 6–1, 6–2