Defending champion Venus Williams defeated her sister Serena in the final, 6–1, 4–6, 6–4 to win the women's singles tennis title at the 1999 Miami Open.
Anastasia Myskina defeated Amélie Mauresmo in the final, 6–2, 6–4 to win the women's singles tennis title at the 2003 Kremlin Cup.
The 1999 Warsaw Cup by Heros singles was the singles event of the fifth edition of the Warsaw Open; a WTA Tier IV tournament held in Warsaw, Poland. Conchita Martínez won the tournament last year when it was a Tier III event. She did not compete this year.
There was no defending champion, due to the cancellation of the semifinals in 1998 due to rain.
The 1999 Eurotel Slovak Open singles was the tennis singles event of the first edition of the most prestigious tournament in Slovakia. In a final of two future World No. 1s, Amélie Mauresmo defeated Kim Clijsters in straight sets, 6–3, 6–3.
The 1999 Wismilak International singles was the singles event of the fifth edition of the most prestigious women's tennis tournament held in Southeast Asia. It was not played the previous year, so there was no defending champion.
The 1999 Wismilak International doubles was the doubles event of the fifth edition of the most prestigious women's tennis tournament held in Southeast Asia. It was not played the previous year, so there was no defending champion.
Yan Zi and Zheng Jie were the defending champions, but did not participate.
Serena Williams was the defending champion and chose not to compete this year.
Cara Black and Irina Selyutina were the defending champions, but both players turned 18 years old during the season and, therefore, were not eligible to compete in Juniors.
Cara Black was the defending champion, but turned 18 years old during the season and, therefore, was ineligible to compete in Juniors.
Nathalie Tauziat was the defending champion, but lost in semifinals to Elena Likhovtseva.
Justine Henin-Hardenne defeated Jelena Dokic in the final, 6–0, 6–4 to win the singles tennis title at the 2003 Swisscom Challenge. With the win, Henin-Hardenne replaced Kim Clijsters as the world No. 1.
Cara Black was the defending champion, but did not compete this year.
Kim Clijsters and Janette Husárová were the defending champions, but none competed this year. Clijsters decided to focus on the singles tournament, which she ended winning.
Laura Golarsa and Katarina Srebotnik were the defending champions, but none competed this year. Golarsa was injured and couldn't play in the entire season, while Srebotnik competed in the Fed Cup at the same week.
The singles Tournament at the 2004 Gaz de France Stars took place in late September to early October, 2004, on indoor hard courts in Hasselt, Belgium.
Kim Clijsters was the defending champion, but did not compete in 2004.
Jelena Kostanić and Michaela Paštiková were the defending champions, but Paštiková did not compete this year. Kostanić teamed up with Tina Pisnik and lost in the semifinals to Tina Križan and Katarina Srebotnik.
Kim Clijsters 
