| No | Date | Nom et lieu du tournoi | Catégorie | Dotation | Surface | Vainqueures | Finalistes | Score | |
|---|
| 1 | 05/01/1998 | ASB Bank Classic Auckland | Tier IV | 107 500 $ | Dur (ext.) | Nana Miyagi
Tamarine Tanasugarn | Julie Halard
Janette Husárová | 7-6, 6-4 | Tableau |
| 2 | 05/01/1998 | Thalgo Hardcourts Championships Gold Coast | Tier III | 164 250 $ | Dur (ext.) | Elena Likhovtseva
Ai Sugiyama | Park Sung-hee
Wang Shi-Ting | 1-6, 6-3, 6-4 | Tableau |
| 3 | 12/01/1998 | ANZ Tasmanian International Hobart | Tier IV | 107 500 $ | Dur (ext.) | Virginia Ruano
Paola Suárez | Julie Halard
Janette Husárová | 7-6, 6-3 | Tableau |
| 4 | 12/01/1998 | Sydney International Sydney | Tier II | 342 500 $ | Dur (ext.) | Martina Hingis
Helena Suková | Katrina Adams
Meredith McGrath | 6-1, 6-2 | Tableau |
| 5 | 19/01/1998 | Australian Open Melbourne | G. Chelem | 4 058 100 $ | Dur (ext.) | Martina Hingis
Mirjana Lučić | Lindsay Davenport
Natasha Zvereva | 6-4, 2-6, 6-3 | Tableau |
| 6 | 02/02/1998 | Toray Pan Pacific Open Tokyo | Tier I | 926 250 $ | Moquette (int.) | Martina Hingis
Mirjana Lučić | Lindsay Davenport
Natasha Zvereva | 7-5, 6-4 | Tableau |
| 7 | 09/02/1998 | Open Gaz de France Paris | Tier II | 450 000 $ | Moquette (int.) | Sabine Appelmans
Miriam Oremans | Anna Kournikova
Larisa Neiland | 1-6, 6-3, 7-6 | Tableau |
| 8 | 16/02/1998 | Copa Colsanitas Bogota | Tier IV | 107 500 $ | Terre (ext.) | Janette Husárová
Paola Suárez | Melissa Mazzotta
Ekaterina Sysoeva | 3-6, 6-2, 6-3 | Tableau |
| 9 | 16/02/1998 | Faber Grand Prix Hanovre | Tier II | 450 000 $ | Moquette (int.) | Lisa Raymond
Rennae Stubbs | Elena Likhovtseva
Caroline Vis | 6-1, 6-7, 6-3 | Tableau |
| 10 | 23/02/1998 | IGA Tennis Classic Oklahoma City | Tier III | 164 250 $ | Dur (int.) | Serena Williams
Venus Williams | Cătălina Cristea
Kristine Radford | 7-5, 6-2 | Tableau |
| 11 | 23/02/1998 | Generali Ladies Tennis Grand Prix Linz | Tier II | 450 000 $ | Moquette (int.) | Alexandra Fusai
Nathalie Tauziat | Anna Kournikova
Larisa Neiland | 6-3, 3-6, 6-4 | Tableau |
| 12 | 05/03/1998 | State Farm Evert Cup Indian Wells | Tier I | 1 250 000 $ | Dur (ext.) | Lindsay Davenport
Natasha Zvereva | Alexandra Fusai
Nathalie Tauziat | 6-4, 2-6, 6-4 | Tableau |
| 13 | 19/03/1998 | The Lipton Championships Miami | Tier I | 1 900 000 $ | Dur (ext.) | Martina Hingis
Jana Novotná | Arantxa Sánchez
Natasha Zvereva | 6-2, 3-6, 6-3 | Tableau |
| 14 | 30/03/1998 | Family Circle Mag. Cup Hilton Head | Tier I | 926 250 $ | Terre (ext.) | Conchita Martínez
Patricia Tarabini | Lisa Raymond
Rennae Stubbs | 3-6, 6-4, 6-4 | Tableau |
| 15 | 06/04/1998 | Bausch & Lomb Championships Amelia Island | Tier II | 450 000 $ | Terre (ext.) | Sandra Cacic
Mary Pierce | Barbara Schett
Patty Schnyder | 7-6, 4-6, 7-6 | Tableau |
| 16 | 13/04/1998 | Makarska International Championships Makarska | Tier IV | 107 500 $ | Terre (ext.) | Tina Križan
Katarina Srebotnik | Evgenia Kulikovskaya
Karin Kschwendt | 7-6, 6-1 | Tableau |
| 17 | 13/04/1998 | Japan Open Tokyo | Tier III | 164 000 $ | Dur (ext.) | Naoko Kijimuta
Nana Miyagi | Amy Frazier
Rika Hiraki | 6-3, 4-6, 6-4 | Tableau |
| 18 | 20/04/1998 | Lotto Open Budapest | Tier IV | 107 500 $ | Terre (ext.) | Virginia Ruano
Paola Suárez | Cătălina Cristea
Laura Montalvo | 4-6, 6-1, 6-1 | Tableau |
| 19 | 27/04/1998 | Croatian Ladies Open Bol | Tier IV | 107 500 $ | Terre (ext.) | Laura Montalvo
Paola Suárez | Joannette Kruger
Mirjana Lučić | Forfait | Tableau |
| 20 | 27/04/1998 | Intersport Damen GP Hambourg | Tier II | 450 000 $ | Terre (ext.) | Barbara Schett
Patty Schnyder | Martina Hingis
Jana Novotná | 7-6, 3-6, 6-3 | Tableau |
| 21 | 04/05/1998 | Italian Open Rome | Tier I | 926 250 $ | Terre (ext.) | Virginia Ruano
Paola Suárez | Amanda Coetzer
Arantxa Sánchez | 7-6, 6-4 | Tableau |
| 22 | 11/05/1998 | German Open Berlin | Tier I | 926 250 $ | Terre (ext.) | Lindsay Davenport
Natasha Zvereva | Alexandra Fusai
Nathalie Tauziat | 6-3, 6-0 | Tableau |
| 23 | 18/05/1998 | Internationaux de Strasbourg Strasbourg | Tier III | 200 000 $ | Terre (ext.) | Alexandra Fusai
Nathalie Tauziat | Yayuk Basuki
Caroline Vis | 6-4, 6-3 | Tableau |
| 24 | 18/05/1998 | Open Paginas Amarillas Madrid | Tier III | 164 250 $ | Terre (ext.) | Florencia Labat
Dominique Monami | Rachel McQuillan
Nicole Pratt | 6-3, 6-1 | Tableau |
| 25 | 25/05/1998 | Roland-Garros Paris | G. Chelem | 4 105 011 $ | Terre (ext.) | Martina Hingis
Jana Novotná | Lindsay Davenport
Natasha Zvereva | 6-1, 7-64 | Tableau |
| 26 | 08/06/1998 | DFS Classic Birmingham | Tier III | 164 250 $ | Gazon (ext.) | Els Callens
Julie Halard | Lisa Raymond
Rennae Stubbs | 2-6, 6-4, 6-4 | Tableau |
| 27 | 15/06/1998 | Heineken Trophy Rosmalen | Tier III | 164 250 $ | Gazon (ext.) | Sabine Appelmans
Miriam Oremans | Cătălina Cristea
Eva Melicharová | 6-7, 7-6, 7-6 | Tableau |
| 28 | 15/06/1998 | Direct Line International Championships Eastbourne | Tier II | 450 000 $ | Gazon (ext.) | Mariaan de Swardt
Jana Novotná | Arantxa Sánchez
Natasha Zvereva | 6-1, 6-3 | Tableau |
| 29 | 22/06/1998 | The Championships Wimbledon | G. Chelem | 4 404 163 $ | Gazon (ext.) | Martina Hingis
Jana Novotná | Lindsay Davenport
Natasha Zvereva | 6-3, 3-6, 8-6 | Tableau |
| 30 | 06/07/1998 | Piberstein Styria Open Maria Lankowitz | Tier IV | 107 500 $ | Terre (ext.) | Laura Montalvo
Paola Suárez | Tina Križan
Katarina Srebotnik | 6-1, 6-2 | Tableau |
| 31 | 06/07/1998 | Skoda Czech Open Prague | Tier III | 160 000 $ | Terre (ext.) | Silvia Farina
Karina Habšudová | Květa Hrdličková
Michaela Paštiková | 2-6, 6-1, 6-2 | Tableau |
| 32 | 13/07/1998 | Torneo Internazionale Palerme | Tier IV | 107 500 $ | Terre (ext.) | Pavlina Nola
Elena Wagner | Barbara Schett
Patty Schnyder | 6-4, 6-2 | Tableau |
| 33 | 13/07/1998 | Warsaw Cup by Heros Varsovie | Tier III | 164 250 $ | Terre (ext.) | Karina Habšudová
Olga Lugina | Liezel Huber
Karin Kschwendt | 7-6, 7-5 | Tableau |
| 34 | 27/07/1998 | Prokom Polish Open Sopot | Tier IV | 107 500 $ | Terre (ext.) | Květa Hrdličková
Helena Vildová | Åsa Svensson
Seda Noorlander | 6-3, 6-2 | Tableau |
| 35 | 27/07/1998 | Bank of the West Classic Stanford | Tier II | 450 000 $ | Dur (ext.) | Lindsay Davenport
Natasha Zvereva | Larisa Neiland
Elena Tatarkova | 6-4, 6-4 | Tableau |
| 36 | 03/08/1998 | Enka Ladies Open Istanbul | Tier IV | 107 500 $ | Dur (ext.) | Meike Babel
Laurence Courtois | Åsa Svensson
Florencia Labat | 6-0, 6-2 | Tableau |
| 37 | 03/08/1998 | Toshiba Classic San Diego | Tier II | 450 000 $ | Dur (ext.) | Lindsay Davenport
Natasha Zvereva | Alexandra Fusai
Nathalie Tauziat | 6-2, 6-1 | Tableau |
| 38 | 10/08/1998 | Boston Cup Boston | Tier III | 164 250 $ | Dur (ext.) | Lisa Raymond
Rennae Stubbs | Mariaan de Swardt
Mary Joe Fernández | 6-4, 6-4 | Tableau |
| 39 | 10/08/1998 | Acura Classic Los Angeles | Tier II | 450 000 $ | Dur (ext.) | Martina Hingis
Natasha Zvereva | Tamarine Tanasugarn
Elena Tatarkova | 6-4, 6-2 | Tableau |
| 40 | 17/08/1998 | Omnium du Maurier Montréal | Tier I | 926 250 $ | Dur (ext.) | Martina Hingis
Jana Novotná | Yayuk Basuki
Caroline Vis | 6-3, 6-4 | Tableau |
| 41 | 24/08/1998 | Pilot Pen International New Haven | Tier II | 450 000 $ | Dur (ext.) | Alexandra Fusai
Nathalie Tauziat | Mariaan de Swardt
Jana Novotná | 6-1, 6-0 | Tableau |
| 42 | 31/08/1998 | US Open Flushing Meadows | G. Chelem | 6 012 000 $ | Dur (ext.) | Martina Hingis
Jana Novotná | Lindsay Davenport
Natasha Zvereva | 6-3, 6-3 | Tableau |
| 43 | 21/09/1998 | Toyota Princess Cup Tokyo | Tier II | 450 000 $ | Dur (ext.) | Anna Kournikova
Monica Seles | Mary Joe Fernández
Arantxa Sánchez | 6-4, 6-4 | Tableau |
| 44 | 05/10/1998 | Porsche Tennis GP Filderstadt | Tier II | 450 000 $ | Dur (int.) | Lindsay Davenport
Natasha Zvereva | Anna Kournikova
Arantxa Sánchez | 6-4, 6-2 | Tableau |
| 45 | 12/10/1998 | European Swisscom Challenge Zurich | Tier I | 926 250 $ | Moquette (int.) | Serena Williams
Venus Williams | Mariaan de Swardt
Elena Tatarkova | 5-7, 6-1, 6-3 | Tableau |
| 46 | 19/10/1998 | MGTS Kremlin Cup Moscou | Tier I | 1 000 000 $ | Moquette (int.) | Mary Pierce
Natasha Zvereva | Lisa Raymond
Rennae Stubbs | 6-3, 6-4 | Tableau |
| 47 | 26/10/1998 | SEAT Open Luxembourg | Tier III | 164 250 $ | Moquette (int.) | Elena Likhovtseva
Ai Sugiyama | Larisa Neiland
Elena Tatarkova | 6-7, 6-3, 2-0,ab. | Tableau |
| 48 | 26/10/1998 | Challenge Bell Québec | Tier III | 164 250 $ | Moquette (int.) | Lori McNeil
Kimberly Po | Chanda Rubin
Sandrine Testud | 6-7, 7-5, 6-4 | Tableau |
| 49 | 02/11/1998 | Sparkassen Cup International GP Leipzig | Tier II | 450 000 $ | Moquette (int.) | Elena Likhovtseva
Ai Sugiyama | Manon Bollegraf
Irina Spîrlea | 6-3, 6-7, 6-1 | Tableau |
| 50 | 09/11/1998 | Advanta Championships Philadelphie | Tier II | 450 000 $ | Moquette (int.) | Elena Likhovtseva
Ai Sugiyama | Monica Seles
Natasha Zvereva | 7-5, 4-6, 6-2 | Tableau |
| 51 | 16/11/1998 | Volvo Women’s Open Pattaya | Tier IV | 107 500 $ | Dur (ext.) | Els Callens
Julie Halard | Rika Hiraki
Aleksandra Olsza | 3-6, 6-2, 6-2 | Tableau |
| 52 | 16/11/1998 | Chase Championships New York | Masters | 2 000 000 $ | Moquette (int.) | Lindsay Davenport
Natasha Zvereva | Alexandra Fusai
Nathalie Tauziat | 6-7, 7-5, 6-3 | Tableau |