Russia: St. Petersburg - Doubles - Main |
| Final | Tarango J./Vacek D. | Oosting M./Pavel A. | 2:1 (3:6, 6:3, 7:5) | details | 14.02.1999 |
| Semi-finals | Oosting M./Pavel A. | Barnard M./Hrbaty D. | 2:1 (3:6, 7:5, 6:1) | details | 12.02.1999 |
| Quarter-finals | Oosting M./Pavel A. | Keil M./Tillstrom M. | 2:0 (7:6, 6:3) | details | 10.02.1999 |
| 1/8-finals | Oosting M./Pavel A. | Silcock G./Wakefield M. | 2:1 (7:6, 6:7, 7:6) | details | 08.02.1999 |
France: Marseille - Doubles - Main |
| 1/8-finals | Broad N./Oosting M. | Mirnyi M./Olhovskiy A. | 0:2 (6:7, 3:6) | details | 01.02.1999 |
Australia: Australian Open - Doubles - Main |
| 1/32-finals | Oosting M./Tieleman L. | Bale L./Kratzmann A. | 1:2 (6:4, 2:6, 2:6) | details | 18.01.1999 |
New Zealand: Auckland - Doubles - Main |
| 1/8-finals | Bale L./Haygarth B. | Oosting M./Vizner P. | 2:0 (7:6, 6:1) | details | 11.01.1999 |
Qatar: Doha - Doubles - Main |
| 1/8-finals | Oosting M./Vizner P. | Santoro F./Delaitre O. | 0:2 (4:6, 2:6) | details | 04.01.1999 |
Sweden: Stockholm - Doubles - Main |
| Quarter-finals | Kempers T./Oosting M. | Reneberg R./Stark J. | 0:2 (3:6, 6:7) | details | 11.11.1998 |
| 1/8-finals | Kempers T./Oosting M. | Vizner P./Waite J. | 2:1 (4:6, 6:4, 6:3) | details | 09.11.1998 |
France: Lyon 2 - Doubles - Main |
| 1/8-finals | Delaitre O./Santoro F. | Kempers T./Oosting M. | 2:0 (6:4, 6:2) | details | 13.10.1998 |
Switzerland: Basel - Doubles - Main |
| 1/8-finals | Oosting M./Vizner P. | Damm M./Suk C. | 1:2 (3:6, 6:3, 3:6) | details | 05.10.1998 |
France: Toulouse - Doubles - Main |
| 1/8-finals | Haggard C./Oosting M. | Clement A./Golmard J. | 0:2 (4:6, 2:6) | details | 28.09.1998 |
Romania: Bucharest - Doubles - Main |
| Semi-finals | Cosac G./Pescariu D-M. | Kempers T./Oosting M. | 2:1 (5:7, 6:2, 6:3) | details | 19.09.1998 |
| Quarter-finals | Moldovan I./Voinea A. | Kempers T./Oosting M. | 1:2 (1:6, 6:4, 2:6) | details | 16.09.1998 |
| 1/8-finals | VanHoudt T./Wibier F. | Kempers T./Oosting M. | 0:2 (1:6, 6:7) | details | 14.09.1998 |
USA: US Open - Mixed Doubles - Main |
| 1/8-finals | Likhovtseva E./Oosting M. | Lucic-Baroni M./Bhupathi M. | 0:2 (3:6, 3:6) | details | 06.09.1998 |
| 1/16-finals | Likhovtseva E./Oosting M. | Adams K./Florent A. | 2:0 (6:4, 7:63) | details | 03.09.1998 |
USA: US Open - Doubles - Main |
| 1/32-finals | Kempers T./Oosting M. | Carbonell T./Roig F. | 1:2 (7:6, 4:6, 4:6) | details | 02.09.1998 |
USA: Long Island - Doubles - Main |
| 1/8-finals | Adams D./Steven B. | Groen S./Oosting M. | 2:0 (7:6, 6:4) | details | 24.08.1998 |
Germany: Stuttgart - Doubles - Main |
| 1/8-finals | Kratzmann A./Oosting M. | Braasch K./Karbacher B. | 1:2 (6:4, 5:7, 3:6) | details | 22.07.1998 |
Sweden: Bastad - Doubles - Main |
| 1/8-finals | Nyborg P./Oosting M. | Bale L./Norval P. | 1:2 (3:6, 6:3, 5:7) | details | 06.07.1998 |
United Kingdom: Wimbledon - Doubles - Main |
| 1/32-finals | Koves G./Tarango J. | Kempers T./Oosting M. | 2:0 (6:3, 6:4) | details | 24.06.1998 |
United Kingdom: Wimbledon - Mixed Doubles - Main |
| 1/32-finals | Oosting M./Appelmans S. | Waite J./Po K. | 0:2 (3:6, 4:6) | details | 24.06.1998 |
Netherlands: Hertogenbosch - Doubles - Main |
| 1/8-finals | Damm M./Grabb J. | Kempers T./Oosting M. | 2:1 (6:7, 7:6, 6:4) | details | 15.06.1998 |
United Kingdom: London - Doubles - Main |
| 1/8-finals | Woodforde M./Woodbridge T. | Kempers T./Oosting M. | 2:0 (6:1, 6:4) | details | 10.06.1998 |
| 1/16-finals | Godwin N./Merklein M. | Kempers T./Oosting M. | 0:2 (3:6, 4:6) | details | 08.06.1998 |
France: French Open - Doubles - Main |
| 1/32-finals | Kempers T./Oosting M. | Johnson D./Montana F. | 0:2 (1:6, 1:6) | details | 29.05.1998 |
Italy: Rome - Doubles - Main |
| 1/16-finals | Kulti N./Nyborg P. | Kempers T./Oosting M. | 2:1 (5:7, 7:6, 6:3) | details | 11.05.1998 |
Germany: Hamburg - Doubles - Main |
| 1/16-finals | Henman T./Rios M. | Kempers T./Oosting M. | 2:0 (6:2, 6:3) | details | 04.05.1998 |
Germany: Munich - Doubles - Main |
| Quarter-finals | Kempers T./Oosting M. | Eagle J./Florent A. | 0:2 (5:7, 6:7) | details | 28.04.1998 |
| 1/8-finals | Kempers T./Oosting M. | Etlis G./Oncins J. | 2:1 (6:4, 5:7, 6:3) | details | 27.04.1998 |
Monaco: Monte Carlo - Doubles - Main |
| Quarter-finals | Kempers T./Oosting M. | Bhupathi M./Paes L. | 0:2 (2:6, 4:6) | details | 23.04.1998 |
| 1/8-finals | Ferreira E./Leach R. | Kempers T./Oosting M. | WO. | details | 21.04.1998 |
| 1/16-finals | Broad N./Norval P. | Kempers T./Oosting M. | 0:2 (5:7, 4:6) | details | 20.04.1998 |
Spain: Barcelona - Doubles - Main |
| 1/8-finals | Eltingh J./Haarhuis P. | Kempers T./Oosting M. | 2:0 (6:1, 6:4) | details | 14.04.1998 |
| 1/16-finals | Kempers T./Oosting M. | Moya C./Vicente F. | 2:0 (7:6, 6:4) | details | 13.04.1998 |
Portugal: Estoril - Doubles - Main |
| 1/8-finals | Kempers T./Oosting M. | Kronemann T./Kitinov A. | 1:2 (6:2, 5:7, 1:6) | details | 06.04.1998 |
Morocco: Casablanca - Doubles - Main |
| Semi-finals | Kempers T./Oosting M. | Brandi C./Messori F. | 1:2 (6:7, 6:4, 3:6) | details | 27.03.1998 |
| Quarter-finals | Kempers T./Oosting M. | Alami K./Arazi H. | 2:0 (7:5, 6:3) | details | 25.03.1998 |
| 1/8-finals | Kempers T./Oosting M. | Kohlmann M./Silcock G. | 2:1 (7:5, 6:7, 6:3) | details | 23.03.1998 |
Denmark: Copenhagen - Doubles - Main |
| Final | Kempers T./Oosting M. | Steven B./Siemerink J. | 2:0 (6:4, 7:6) | details | 15.03.1998 |
| Semi-finals | Arthurs W./Kilderry P. | Kempers T./Oosting M. | 0:2 (4:6, 1:6) | details | 13.03.1998 |
| Quarter-finals | Kempers T./Oosting M. | Knippschild J./Prinosil D. | 2:0 (7:6, 6:1) | details | 11.03.1998 |
| 1/8-finals | Kempers T./Oosting M. | Nijssen T./Pimek L. | 2:1 (6:7, 7:6, 6:4) | details | 09.03.1998 |
Netherlands: Rotterdam - Doubles - Main |
| Quarter-finals | Damm M./Novak J. | Kempers T./Oosting M. | 2:0 (6:2, 6:4) | details | 04.03.1998 |
| 1/8-finals | Pimek L./Wibier F. | Kempers T./Oosting M. | 0:2 (4:6, 4:6) | details | 02.03.1998 |
Italy: London - Doubles - Main |
| Quarter-finals | Eagle J./Florent A. | Kempers T./Oosting M. | 2:1 (6:7, 6:4, 7:6) | details | 25.02.1998 |
| 1/8-finals | Kempers T./Oosting M. | Goellner M./Tillstrom M. | 2:1 (6:3, 3:6, 7:6) | details | 23.02.1998 |
Russia: St. Petersburg - Doubles - Main |
| Semi-finals | Barnard M./Haygarth B. | Kempers T./Oosting M. | 2:0 (7:5, 6:4) | details | 13.02.1998 |