Justine Henin-Hardenne was the defending champion, and successfully defended her title, defeating Svetlana Kuznetsova in the final 6–4, 6–4 to win her third French Open title. Henin-Hardenne won the title without losing a set in the entire tournament.
Cara Black and Liezel Huber were the defending champions, but lost in the quarterfinals to sisters Alona Bondarenko and Kateryna Bondarenko.
The 1999 Evert Cup – Singles was the singles event of the eleventh edition of the tennis tournament played at Indian Wells, California, United States. It is the second WTA Tier I tournament of the year, and part of the US Spring tennis season. World No. 1 Martina Hingis was the defending champion but lost in the quarterfinals to Chanda Rubin.
María José Martínez Sánchez was the defending champion, but lost in the first round to Ekaterina Makarova.
Serena Williams and Venus Williams were the defending champions, but both withdrew from the tournament with a pulmonary embolism and a hip injury, respectively.
In the final, Andrea Hlaváčková and Lucie Hradecká defeated 7th seeded Sania Mirza and Elena Vesnina in straight sets, 6–4, 6–3.
Vania King and Yaroslava Shvedova were the defending champions and they reached the final. Liezel Huber and Lisa Raymond defeated them 4–6, 7–6(7–5), 7–6(7–3) to win the title.
The 1999 Italian Open – Singles was the singles 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. Martina Hingis was the defending champion but lost in the semifinals to Venus Williams.
Andrea Hlaváčková and Lucie Hradecká were the defending champions, but lost in the semifinals to Maria Kirilenko and Nadia Petrova.
Sara Errani and Roberta Vinci won the tournament by defeating Maria Kirilenko and Nadia Petrova 4–6, 6–4, 6–2 in the final.
Victoria Azarenka was the defending champion, and successfully defended her title, defeating Li Na in the final 4–6, 6–4, 6–3.
Victoria Azarenka was the defending champion, but withdrew before her quarterfinal match.
Maria Sharapova won her second Indian Wells title, defeating 2011 champion Caroline Wozniacki in the final, 6–2, 6–2.
Agnieszka Radwańska was the defending champion, but lost in the semifinals to the eventual champion Serena Williams.
The 1999 Sanex Trophy – Singles was the singles event of the first edition of the Sanex Trophy; a WTA Tier IV tournament and one of the most prestigious women's tennis tournament held in Belgium.
Mona Barthel was the defending champion, but lost in the first round to Kirsten Flipkens.
Elina Svitolina was the two-time defending champion, but chose not to participate this year.
Lucie Hradecká and Mirjana Lučić-Baroni were the defending champions, but lost in the quarterfinals to Barbora Krejčíková and An-Sophie Mestach.
Sara Errani was the defending champion, but chose to compete in Dubai instead.
Timea Bacsinszky was the defending champion, but chose to compete in Doha instead.
Paula Cristina Gonçalves and Beatriz Haddad Maia were the defending champions, but Haddad Maia chose not to participate this year. Gonçalves played alongside Sanaz Marand, but lost in the first round to Sílvia Soler Espinosa and Anna Tatishvili.
Lara Arruabarrena and Tatjana Maria won the title, defeating Gabriela Cé and Andrea Gámiz in the final, 6–2, 4–6, [10–8].
Lesia Tsurenko was the defending champion, but lost in the first round to Sorana Cîrstea.
Anabel Medina Garrigues and Arantxa Parra Santonja were the defending champions, but chose not to participate this year.
