 USA: US Open - Doubles - Main |
|---|
| 1/32-finals | Burgin E./Fairbank-Nideffer R. | Barg-Mager P./Louie Harper P. | 2:0 (6:2, 6:3) | details | 27.08.1990 |
| USA: Los Angeles - Doubles - Main |
|---|
| 1/16-finals | Louie Harper P./Barg-Mager P. | Gregory L./Rush G. | 0:2 (6:7, 4:6) | details | 13.08.1990 |
 United Kingdom: Wimbledon - Doubles - Main |
|---|
| 1/16-finals | Gregory L./Rush G. | Louie Harper P./Barg-Mager P. | 2:0 (6:4, 6:1) | details | 01.07.1990 |
| 1/32-finals | Bollegraf M./Cordwell B. | Louie Harper P./Barg-Mager P. | 0:2 (5:7, 4:6) | details | 30.06.1990 |
| United Kingdom: Eastbourne - Doubles - Main |
|---|
| 1/16-finals | Borneo B./Wood C. | Louie Harper P./Barg-Mager P. | 2:0 (6:4, 6:3) | details | 18.06.1990 |
| USA: Tampa - Doubles - Main |
|---|
| Semi-finals | Paz M./Sanchez-Vicario A. | Barg-Mager P./Louie Harper P. | 2:0 (6:4, 6:2) | details | 21.04.1990 |
| Quarter-finals | Barg-Mager P./Louie Harper P. | Castro G./Martinez C. | 2:0 (6:3, 6:3) | details | 18.04.1990 |
| 1/8-finals | Barg-Mager P./Louie Harper P. | Ferrando L./La Fratta S. | 2:0 (6:3, 6:3) | details | 16.04.1990 |
| USA: Miami - Doubles - Main |
|---|
| 1/8-finals | Barg-Mager P./Louie Harper P. | Burgin E./Fairbank-Nideffer R. | 0:2 (2:6, 3:6) | details | 20.03.1990 |
| 1/16-finals | Barg-Mager P./Louie Harper P. | Phelps T./Probst W. | 2:0 (7:6, 6:1) | details | 18.03.1990 |
| USA: Boca Raton - Doubles - Main |
|---|
| 1/8-finals | Novotna J./Sukova H. | Barg-Mager P./Louie Harper P. | 2:0 (6:2, 6:4) | details | 07.03.1990 |
| 1/16-finals | Barg-Mager P./Louie Harper P. | Amiach S./Pierce M. | 2:0 (6:3, 6:1) | details | 05.03.1990 |
| USA: Indian Wells - Doubles - Main |
|---|
| 1/8-finals | Louie Harper P./Barg-Mager P. | Bradtke-Provis N./Reinach E. | 0:2 (4:6, 4:6) | details | 28.02.1990 |
| 1/16-finals | Louie Harper P./Barg-Mager P. | Leand A./Loosemore S. | 2:0 (6:2, 6:4) | details | 26.02.1990 |
| USA: Chicago - Doubles - Main |
|---|
| 1/8-finals | Barg-Mager P./Louie Harper P. | Daniels M./Prausa W. | 1:2 (7:6, 1:6, 6:7) | details | 12.02.1990 |
| USA: Wichita - Doubles - Main |
|---|
| Quarter-finals | Barg-Mager P./Louie Harper P. | Bradtke-Provis N./White A. | 1:2 (6:4, 2:6, 3:6) | details | 07.02.1990 |
| 1/8-finals | Barg-Mager P./Louie Harper P. | Foxworth K./Whittington T. | 2:0 (6:3, 7:5) | details | 05.02.1990 |
