Arantxa Sánchez Vicario and Natasha Zvereva were the defending champions but lost in the final 6–2, 3–6, 6–3 against Martina Hingis and Jana Novotná.
The 1999 Thalgo Australian Women's Hardcourts doubles was the doubles event of the third edition of the Thalgo Australian Women's Hardcourts; a WTA Tier III tournament held in the Gold Coast. Elena Likhovtseva and Ai Sugiyama were the defending champions but lost in the first round to Anke Huber and Mary Pierce.
The 1999 Open Gaz de France was a women's tennis tournament played on indoor hardcourts at the Stade Pierre de Coubertin in Paris in France that was part of Tier II of the 1999 WTA Tour. It was the seventh edition of the tournament and was held from 22 February until 28 February 1999. Unseeded Serena Williams won the singles title and earned $80,000 first-prize money. It was her first WTA singles title. On the same day her sister Venus won the IGA Superthrift Tennis Classic tournament, making them the first sisters to win WTA events in the same week.
The 1999 Evert Cup doubles was the doubles event of the eleventh edition of the tennis tournament played at Indian Wells, California, United States. It was the second WTA Tier I tournament of the year, and part of the US Spring tennis season. Lindsay Davenport and Natasha Zvereva were the defending champions but lost in the quarterfinals to Serena Williams and Venus Williams.
Martina Hingis and Jana Novotná were the defending champions but decided not to compete together. Hingis partnered with Anna Kournikova but withdrew before the start of the tournament. Novotná competed with Natasha Zvereva but lost in the semifinals to Mariaan de Swardt and Elena Tatarkova.
The 1999 Australian Open women's doubles was the women's doubles event of the eighty-seventh edition of the Australian Open, the first Grand Slam of the year and the most prestigious tournament in the Asia-Pacific and the Southern Hemisphere. Martina Hingis and Mirjana Lučić were the defending champions, but Hingis competed with Russian Anna Kournikova, and Lučić competed with Frenchwoman Mary Pierce. Lučić and Pierce were defeated in the first round by Christina Singer and Helena Vildová.
Hingis and Kournikova, however, ended up winning the title, defeating first seeds Lindsay Davenport and Natasha Zvereva, 7–5, 6–3. With this win, Hingis won her fifth consecutive Grand Slam title in doubles, and became the only woman to have won three consecutive Australian Open titles in singles and doubles simultaneously. Hingis and her partners defeated Davenport/Zvereva for all five consecutive women's doubles titles starting with the 1998 Australian and ending with the 1999 Australian Open.
The 1999 French Open mixed doubles was the mixed event of the ninety-eighth edition of the French Open, the second Grand Slam of the year. Justin Gimelstob and Venus Williams were the defending champions, but they did not compete this year.
Serena and Venus Williams defeated Martina Hingis and Anna Kournikova in the final, 6–3, 6–7(2–7), 8–6 to win the women's doubles tennis title at the 1999 French Open. It was the first major title for the Williams sisters, and would be their first step towards completing the career Golden Slam in doubles.
Serena and Venus Williams defeated Chanda Rubin and Sandrine Testud in the final, 4–6, 6–1, 6–4 to win the women's doubles tennis title at the 1999 US Open. It was the second doubles major title for the Williams sisters, and their second step towards completing the career Golden Slam in doubles.
The 1999 Italian Open doubles was the doubles event of the fifty-fifth edition of the tennis tournament played at Rome, Italy, the most prestigious tennis tournament in Southern Europe. It was the fifth WTA Tier I tournament of the year, and part of the European claycourt season. Virginia Ruano Pascual and Paola Suárez were the defending champions, but lost to Martina Hingis and Anna Kournikova in the quarterfinals.
The 1999 WTA German Open singles was the singles event of the fifty-fifth edition of the tennis tournament played at Berlin, Germany, the most prestigious tennis tournament in Latin Europe. It was the sixth WTA Tier I tournament of the year, and part of the European claycourt season. Lindsay Davenport and Natasha Zvereva were the defending champions, but only Zvereva participated this year with Mary Pierce. They were eliminated in the first round by Brie Rippner and Tara Snyder.
The 1999 du Maurier Open doubles was the doubles event of the one hundred and tenth edition of the Canadian Open; a WTA Tier I tournament and the most prestigious women's tennis tournament held in Canada.
The 1999 Swisscom Challenge doubles was the doubles event of the sixteenth edition of the Swisscom Challenge; a WTA Tier I tournament and the most prestigious tournament held in Switzerland. Serena and Venus Williams were the defending champions, but neither competed this year.
The 1999 SEAT Open Luxembourg – Doubles was the doubles event of the ninth edition of the most prestigious women's tennis tournament held in Luxembourg. Elena Likhovtseva and Ai Sugiyama was the defending champion but she did not compete in this year.
The 1999 Generali Ladies Linz – Doubles was the tennis doubles event of the thirteenth edition of the most prestigious tournament in Austria. Alexandra Fusai and Nathalie Tauziat were the two-time defending champions, but they were defeated in the semifinals by Tina Križan and Larisa Neiland.
The 1999 Sparkassen Cup – Doubles was the tennis doubles event of the tenth edition of the Sparkassen Cup; a WTA Tier II tournament held in Leipzig, Germany. Elena Likhovtseva and Ai Sugiyama were the defending champions but were defeated in this year's final by Larisa Neiland and Mary Pierce, 6–1, 6–3.
The 1999 Advanta Championships of Philadelphia – Doubles was the tennis doubles event of the seventeenth edition of the Advanta Championships of Philadelphia; a WTA Tier II tournament held in Philadelphia, Pennsylvania. Elena Likhovtseva and Ai Sugiyama were the defending champions, but Sugiyama did not compete this year. Likhovtseva competed with Amanda Coetzer, but were defeated in the quarterfinals by Lisa Raymond and Rennae Stubbs.
Martina Hingis and Anna Kournikova were the defending champions, but competed this year with different partners. Hingis partnered with Mary Pierce and finished the tournament as runners-up, while Kournikova teamed up with Barbara Schett and lost in semifinals to Lisa Raymond and Rennae Stubbs.
Elena Likhovtseva and Ai Sugiyama were the defending champions, but had different outcomes. While Likhovtseva teamed up with Amanda Coetzer and lost in first round, Sugiyama teamed up with Julie Halard-Decugis and successfully defended her title by defeating Martina Hingis and Mary Pierce in the final, 6–0, 6–3.
Irina Spîrlea and Caroline Vis were the defending champions, but Spîrlea did not compete this year. Vis teamed up with Barbara Schett, but withdrew before their semifinal match due to Schett's right toe infection.
Irina Spîrlea 
Caroline Vis 
Elena Likhovtseva 
Ai Sugiyama 
