| Singles | |
|---|---|
| 1983 Cologne Cup | |
| Champion |  Matt Doyle |
| Runner-up |  Hans-Dieter Beutel |
| Score | 1–6, 6–1, 6–2 |
| Draw | 32 |
| Seeds | 8 |
Kevin Curren was the defending champion, but did not compete this year.
Matt Doyle won the title by defeating Hans-Dieter Beutel 1–6, 6–1, 6–2 in the final. [1] [2]
Brian Gottfried (first round) Sandy Mayer (quarterfinals, withdrew)
Tomáš Šmíd (first round) Mel Purcell (first round) Tim Mayotte (first round)
Shlomo Glickstein (second round) Eric Korita (second round, retired) Mark Dickson (second round)| Semifinals | Final | ||||||||||||
| Hans-Dieter Beutel | 7 | 2 | 6 | ||||||||||
| Pavel Složil | 5 | 6 | 1 | ||||||||||
| Hans-Dieter Beutel | 6 | 1 | 2 | ||||||||||
| Matt Doyle | 1 | 6 | 6 | ||||||||||
| Matt Doyle | 3 | 6 | 6 | ||||||||||
 Bernard Mitton | 6 | 3 | 4 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | B Gottfried | 3 | 6 | ||||||||||||||||||||||||
| S Smith | 6 | 7 | S Smith | 5 | 4 | ||||||||||||||||||||||
| Q | E Jelen | 4 | 6 | 6 | Q | E Jelen | 7 | 6 | |||||||||||||||||||
| S Lipton | 6 | 3 | 1 | Q | E Jelen | 4 | 5 | ||||||||||||||||||||
| HD Beutel | 6 | 6 | 6 | HD Beutel | 6 | 7 | |||||||||||||||||||||
 C Kirmayr | 7 | 4 | 4 | HD Beutel | 6 | 7 | |||||||||||||||||||||
 M Schapers | 2 | 6 | 2 | 6 | S Glickstein | 1 | 6 | ||||||||||||||||||||
| 6 | S Glickstein | 6 | 2 | 6 | HD Beutel | 7 | 2 | 6 | |||||||||||||||||||
| 4 | M Purcell | 5 | 3 | P Složil | 5 | 6 | 1 | ||||||||||||||||||||
| C Motta | 7 | 6 | C Motta | 6 | 4 | 6 | |||||||||||||||||||||
| Q | P Annacone | 6 | 6 | 6 | N Saviano | 3 | 6 | 7 | |||||||||||||||||||
| N Saviano | 3 | 7 | 7 | N Saviano | 3 | 4 | |||||||||||||||||||||
| P Složil | 6 | 6 | P Složil | 6 | 6 | ||||||||||||||||||||||
| E Fromm | 4 | 4 | P Složil | 6 | 6 | ||||||||||||||||||||||
| Q |  T Benhabiles | 2 | 2 | 8 | M Dickson | 2 | 4 | ||||||||||||||||||||
| 8 | M Dickson | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | E Korita | 6 | 5 | 6 | |||||||||||||||||||||||
| M Hocevar | 3 | 7 | 4 | 7 | E Korita | 2 | 0r | ||||||||||||||||||||
 B Boileau | 4 | 0 |  M Ostoja | 6 | 3 | ||||||||||||||||||||||
| M Ostoja | 6 | 6 | M Ostoja | 4 | 0 | ||||||||||||||||||||||
 F Segărceanu | 0 | 6 | 6 | M Doyle | 6 | 6 | |||||||||||||||||||||
| P Elter | 6 | 2 | 2 | F Segărceanu | 4 | 1 | |||||||||||||||||||||
| M Doyle | 4 | 6 | 6 | M Doyle | 6 | 6 | |||||||||||||||||||||
| 3 | T Šmíd | 6 | 3 | 4 | M Doyle | 3 | 6 | 6 | |||||||||||||||||||
| 5 | T Mayotte | 4 | 5 | B Mitton | 6 | 3 | 4 | ||||||||||||||||||||
| T Wilkison | 6 | 7 | T Wilkison | 6 | 4 | ||||||||||||||||||||||
| B Mitton | 6 | 6 | B Mitton | 7 | 6 | ||||||||||||||||||||||
| Q | J Becka | 3 | 4 | B Mitton | w/o | ||||||||||||||||||||||
| A Maurer | 7 | 6 | 2 | S Mayer | |||||||||||||||||||||||
| D Visser | 6 | 2 | A Maurer | ||||||||||||||||||||||||
| B Becker | 6 | 4 | 4 | 2 | S Mayer | w/o | |||||||||||||||||||||
| 2 | S Mayer | 3 | 6 | 6 | |||||||||||||||||||||||
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