| As of 1 January 1980 |
| Rk |
Name |
Nation |
| 1 |
Björn Borg |
|
| 2 |
Jimmy Connors |
|
| 3 |
John McEnroe |
|
| 4 |
Vitas Gerulaitis |
|
| 5 |
Roscoe Tanner |
|
| 6 |
Guillermo Vilas |
|
| 7 |
Arthur Ashe |
|
| 8 |
Harold Solomon |
|
| 9 |
José Higueras |
|
| 10 |
Eddie Dibbs |
|
| 11 |
Víctor Pecci |
|
| 12 |
Gene Mayer |
|
| 13 |
Peter Fleming |
|
| 14 |
Hans Gildemeister |
|
| 15 |
Wojtek Fibak |
|
| 16 |
José Luis Clerc |
|
| 17 |
Brian Gottfried |
|
| 18 |
Pat Du Pré |
|
| 19 |
Manuel Orantes |
|
| 20 |
Ivan Lendl |
|
|
| Year-end rankings (December 1980) |
| Rk |
Name |
Nation |
Points |
High |
Low |
Change |
| 1 |
Björn Borg |
|
|
|
|
= |
| 2 |
John McEnroe |
|
|
|
|
+1 |
| 3 |
Jimmy Connors |
|
|
|
|
-1 |
| 4 |
Gene Mayer |
|
|
|
|
+8 |
| 5 |
Guillermo Vilas |
|
|
|
|
+1 |
| 6 |
Ivan Lendl |
|
|
|
|
+14 |
| 7 |
Harold Solomon |
|
|
|
|
+1 |
| 8 |
José Luis Clerc |
|
|
|
|
+8 |
| 9 |
Vitas Gerulaitis |
|
|
|
|
–5 |
| 10 |
Eliot Teltscher |
|
|
|
|
+17 |
| 11 |
Brian Gottfried |
|
|
|
|
+17 |
| 12 |
Brian Teacher |
|
|
|
|
+49 |
| 13 |
Eddie Dibbs |
|
|
|
|
–3 |
| 14 |
Roscoe Tanner |
|
|
|
|
–9 |
| 15 |
Wojtek Fibak |
|
|
|
|
= |
| 16 |
John Sadri |
|
|
|
|
+14 |
| 17 |
Victor Amaya |
|
|
|
|
+6 |
| 18 |
Johan Kriek |
|
|
|
|
+17 |
| 19 |
Balázs Taróczy |
|
|
|
|
+26 |
| 20 |
Vijay Amritraj |
|
|
|
|
+14 |
|