 USA: Pinehurst - Doubles - Main |
|---|
| 1/8-finals | Mattar L./Oncins J. | Devening B./Shelton B. | 0:2 (3:6, 1:6) | details | 11.04.1994 |
| USA: Miami - Doubles - Main |
|---|
| 1/32-finals | Mattar L./Oncins J. | Boetsch A./Delaitre O. | 1:2 (4:6, 7:5, 3:6) | details | 07.03.1994 |
 Brazil: Sao Paulo 2 - Doubles - Main |
|---|
| Quarter-finals | Bauer M./Rikl D. | Mattar L./Oncins J. | 2:0 (7:6, 7:6) | details | 03.11.1993 |
| 1/8-finals | Mattar L./Oncins J. | Koevermans M./Van Emburgh G. | 2:1 (6:3, 3:6, 7:6) | details | 01.11.1993 |
 Chile: Santiago - Doubles - Main |
|---|
| 1/8-finals | Mattar L./Oncins J. | Bauer M./Rikl D. | 1:2 (7:6, 6:7, 3:6) | details | 25.10.1993 |
 Italy: Palermo - Doubles - Main |
|---|
| Semi-finals | Casal S./Sanchez E. | Mattar L./Oncins J. | 2:0 (6:1, 6:0) | details | 02.10.1993 |
| Quarter-finals | Brandi C./Mordegan F. | Mattar L./Oncins J. | 0:2 (2:6, 1:6) | details | 30.09.1993 |
| 1/8-finals | De La Pena H./Montana F. | Mattar L./Oncins J. | 0:2 (6:7, 3:6) | details | 27.09.1993 |
 France: French Open - Doubles - Main |
|---|
| 1/8-finals | Mattar L./Oncins J. | Davids H. J./Norval P. | 1:2 (6:3, 3:6, 7:9) | details | 31.05.1993 |
| 1/16-finals | Mattar L./Oncins J. | Pimek L./Steven B. | 2:1 (6:4, 3:6, 6:3) | details | 27.05.1993 |
| 1/32-finals | DeVries S./MacPherson D. | Mattar L./Oncins J. | 0:2 (6:7, 6:7) | details | 24.05.1993 |
| Italy: Rome - Doubles - Main |
|---|
| 1/8-finals | Jensen L./Jensen M. | Mattar L./Oncins J. | 2:0 (6:2, 7:5) | details | 12.05.1993 |
| 1/16-finals | Mattar L./Oncins J. | Costa C./Svensson J. | 2:0 (7:6, 6:4) | details | 10.05.1993 |
 Germany: Hamburg - Doubles - Main |
|---|
| Quarter-finals | Connell G./Galbraith P. | Mattar L./Oncins J. | 2:0 (7:6, 6:4) | details | 07.05.1993 |
| 1/8-finals | Mattar L./Oncins J. | Suk C./Warder L. | 2:1 (6:3, 6:7, 6:4) | details | 05.05.1993 |
| 1/16-finals | Jensen L./Jensen M. | Mattar L./Oncins J. | 1:2 (6:3, 4:6, 4:6) | details | 03.05.1993 |
 Spain: Madrid 2 - Doubles - Main |
|---|
| 1/8-finals | Mattar L./Oncins J. | Becker B./Motta C. | 1:2 (3:6, 6:3, 2:6) | details | 26.04.1993 |
| USA: Miami - Doubles - Main |
|---|
| 1/32-finals | Mattar L./Oncins J. | Davis S./Palmer J. | 0:2 (3:6, 2:6) | details | 08.03.1993 |
| Brazil: Buzios - Doubles - Main |
|---|
| Semi-finals | Mattar L./Oncins J. | Keil M./Mercer T. | 0:2 (3:6, 4:6) | details | 05.11.1992 |
| Quarter-finals | Mattar L./Oncins J. | Frana J./Miniussi C. | 2:1 (6:7, 6:1, 6:4) | details | 03.11.1992 |
| 1/8-finals | Acioly R./Nelson T. | Mattar L./Oncins J. | 1:2 (4:6, 6:1, 3:6) | details | 02.11.1992 |
| Brazil: Guaruja - Doubles - Main |
|---|
| 1/8-finals | Mattar L./Oncins J. | Ruah M./Tabares M. | 1:2 (3:6, 7:5, 3:6) | details | 26.10.1992 |
| USA: US Open - Doubles - Main |
|---|
| 1/32-finals | Mattar L./Oncins J. | Grabb J./Reneberg R. | 0:2 (6:7, 4:6) | details | 31.08.1992 |
 World: Olympic Games - Doubles - Main |
|---|
| 1/16-finals | Mattar L./Oncins J. | Casal S./Sanchez E. | 2:3 (3:6, 6:3, 7:6, 3:6, 1:6) | details | 27.07.1992 |
 Austria: Kitzbuhel - Doubles - Main |
|---|
| 1/8-finals | Apell J./Donar J. | Mattar L./Oncins J. | 2:0 (6:4, 6:2) | details | 22.07.1992 |
| Germany: Stuttgart - Doubles - Main |
|---|
| 1/8-finals | Ferreira W./Norval P. | Mattar L./Oncins J. | 2:0 (6:1, 6:4) | details | 15.07.1992 |
| 1/16-finals | Mattar L./Oncins J. | Miniussi C./Perez D. | 2:1 (6:3, 2:6, 6:3) | details | 13.07.1992 |
 Sweden: Bastad - Doubles - Main |
|---|
| 1/8-finals | Mattar L./Oncins J. | Pedersen B./Rahnasto O. | 0:2 (2:6, 4:6) | details | 06.07.1992 |
| France: French Open - Doubles - Main |
|---|
| 1/32-finals | Mattar L./Oncins J. | Nijssen T./Suk C. | 1:2 (6:4, 3:6, 4:6) | details | 25.05.1992 |
| Italy: Genoa - Doubles - Main |
|---|
| 1/8-finals | Mattar L./Oncins J. | Boscatto M./Perez D. | 1:2 (3:6, 6:4, 1:6) | details | 27.04.1992 |
| Brazil: Maceio - Doubles - Main |
|---|
| 1/8-finals | Mattar L./Oncins J. | Aerts N./Marcelino D. | 0:2 (4:6, 6:7) | details | 03.02.1992 |
 Switzerland: Geneva - Doubles - Main |
|---|
| Quarter-finals | Bruguera S./Rosset M. | Mattar L./Oncins J. | WO. | details | 11.09.1991 |
| 1/8-finals | Furlan R./Mezzadri C. | Mattar L./Oncins J. | 0:2 (2:6, 2:6) | details | 09.09.1991 |
| USA: US Open - Doubles - Main |
|---|
| 1/16-finals | Mattar L./Oncins J. | Beckman C./Salumaa S. | 1:2 (6:4, 3:6, 4:6) | details | 29.08.1991 |
| 1/32-finals | Mattar L./Oncins J. | Bruguera S./Carbonell T. | 2:0 (6:2, 6:4) | details | 26.08.1991 |
| USA: Long Island - Doubles - Main |
|---|
| Quarter-finals | Mattar L./Oncins J. | Garnett B./Lozano J. | 0:2 (3:6, 4:6) | details | 21.08.1991 |
| 1/8-finals | Mattar L./Oncins J. | Jonsson O./Van Emburgh G. | 2:0 (6:3, 7:6) | details | 19.08.1991 |
| USA: New Haven 2 - Doubles - Main |
|---|
| Semi-finals | Mattar L./Oncins J. | Korda P./Masur W. | 0:2 (3:6, 5:7) | details | 17.08.1991 |
| Quarter-finals | Krajicek R./Siemerink J. | Mattar L./Oncins J. | WO. | details | 15.08.1991 |
| 1/8-finals | Mattar L./Oncins J. | Grabb J./Kratzmann M. | 2:1 (6:7, 7:5, 6:4) | details | 14.08.1991 |
| 1/16-finals | Mattar L./Oncins J. | Pimek L./Vacek D. | 2:0 (7:6, 6:3) | details | 12.08.1991 |
 United Kingdom: Wimbledon - Doubles - Main |
|---|
| 1/32-finals | DeVries S./MacPherson D. | Mattar L./Oncins J. | 2:0 (6:3, 7:5) | details | 01.07.1991 |
| United Kingdom: Manchester - Doubles - Main |
|---|
| Quarter-finals | Mattar L./Oncins J. | Bates J./Warder L. | 0:2 (6:7, 2:6) | details | 19.06.1991 |
| 1/8-finals | Mattar L./Oncins J. | Davis S./Van't Hof R. | 2:0 (6:3, 6:4, 3:, 3636:) | details | 17.06.1991 |
| United Kingdom: London - Doubles - Main |
|---|
| 1/16-finals | Mattar L./Oncins J. | Woodforde M./Woodbridge T. | 0:2 (5:7, 3:6) | details | 10.06.1991 |
