Lindsay Davenport was the defending champion but lost in the quarterfinals to Serena Williams.
Serena Williams was the defending champion, but she chose not to compete that year.
Jana Novotná was the defending champion but lost in the semifinals to Lindsay Davenport.
Serena Williams and Venus Williams were the defending champions, but Serena withdrew from the tournament and Venus chose not to participate with another player.
Martina Hingis and Anna Kournikova defeated Daniela Hantuchová and Arantxa Sánchez Vicario 6–2, 6–7(4–7), 6–1 in the final to win the title.
Martina Hingis was the defending champion but lost in the semifinals to Mary Pierce.
The 1999 Faber Grand Prix singles was the singles event of the seventh edition of the Faber Grand Prix; a WTA Tier II tournament held in Hanover, Germany. Patty Schnyder was the defending champion but lost in the second round to Elena Likhovtseva.
The 1999 Open Gaz de France singles was the singles event of the seventh edition of the Open GDF Suez; a WTA Tier II tournament held in Paris, France. Mary Pierce was the defending champion but did not compete that year.
The 1999 Lipton Championships women's singles was the women's singles event of the fifteenth edition of the tennis tournament played at Miami, United States. It is the third WTA Tier I tournament of the year, and part of the US Spring tennis season. Venus Williams was the defending champion, and she successfully defending her title by defeating her sister Serena in the final 6–1, 4–6, 6–4.
The 1999 Family Circle Cup singles was the singles event of the twenty-seventh edition of the tennis tournament played at Hilton Head, United States. It is the third WTA Tier I tournament of the year, and part of the US Spring tennis season. Amanda Coetzer was the defending champion but lost in the third round to Henrieta Nagyová.
Martina Hingis defeated Lindsay Davenport in the final, 6–3, 6–2 to win the women's singles tennis title at the 2000 Miami Open. She did not lose a set, and lost only 21 games, en route to 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.
The 1999 Swisscom Challenge singles was the singles event of the sixteenth edition of the Swisscom Challenge; a WTA Tier I tournament and the most prestigious tournament held in Switzerland. Lindsay Davenport was the two-time defending champion, but she did not compete this year.
Serena and Venus Williams defeated Lindsay Davenport and Corina Morariu in the final, 6–2, 4–6, 6–4 to win the women's doubles tennis title at the 2001 Australian Open. It was the Williams sisters' fourth major doubles title, and they completed the career Golden Slam in doubles with the win.
The 1999 TIG Classic singles was the singles event of the twentieth edition of the second tournament in the US Open Series.
The 1999 Acura Classic singles was the singles event of the twentieth edition of the third tournament in the US Open Series.
The 1999 Pilot Pen Tennis singles was the singles event of the seventeenth edition of the final tournament in the US Open Series. Steffi Graf was the defending champion, but had retired after the TIG Classic.
The 1999 Porsche Tennis Grand Prix was a women's tennis tournament played on indoor hard courts in Filderstadt, Germany. that was part of Tier II of the 1999 WTA Tour. It was the 22nd edition of the tournament and was held from 4 October until 10 October 1999. First-seeded Martina Hingis won the singles title, her third at the event after 1996 and 1997, and earned $80,000 first prize money.
Martina Hingis and Anna Kournikova were the defending champions, but none of them competed this year.
Cristina Torrens Valero was the defending champion, but lost in first round to Joanna Sakowicz.
Katarina Srebotnik was the defending champion, but lost in first round to Seda Noorlander.
Martina Hingis 
Mary Pierce 
