Lindsay Davenport was the defending champion, but lost to Jennifer Capriati in the semifinals, in a rematch of their semifinal at the 2000 Australian Open.
Iva Majoli was the defending champion, but lost to Lindsay Davenport in the quarterfinals.
Martina Hingis was the defending champion, but lost in the final to Lindsay Davenport, 6–3, 7–5, in a rematch of last year's semifinal.
Lindsay Davenport was the defending champion but lost in the semifinals to Mary Pierce.
The 1998 du Maurier Open – Women's Singles was the women's singles event of the one hundred and ninth edition of the Canadian Open; a WTA Tier I tournament and the most prestigious women's tennis tournament held in Canada. Monica Seles was the defending champion and won in the final 6–3, 6–2 against Arantxa Sánchez Vicario.
Monica Seles was the defending champion and won in the final 4–6, 6–3, 6–4 against Arantxa Sánchez Vicario.
Jana Novotná was the defending champion but did not compete that year.
Martina Hingis was the defending champion but lost in the quarterfinals to Steffi Graf.
The 1999 Bausch & Lomb Championships – Singles was the singles event of the twentieth edition of the Bausch & Lomb Championships; a WTA Tier II tournament held in Amelia Island, Florida, United States, played on green clay. Mary Pierce was the defending champion but lost in the quarterfinals to Conchita Martínez.
Karolína Plíšková was the defending champion; she chose, however, not to defend her title.
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.
Ksenia Pervak was the defending champion, but decided not to participate.
Angelique Kerber was the defending champion, but she decided not to participate this year.
Mona Barthel won 7–5, 7–6(7–4) against Sara Errani in the final to capture the title.
Monica Niculescu was the defending champion, but retired in the quarterfinals against Carla Suárez Navarro.
Klára Zakopalová won the title, defeating Garbiñe Muguruza in the final, 4–6, 7–5, 6–0.
Arantxa Sánchez Vicario was the defending champion, but she lost in the second round to Mercedes Paz.
Serena Williams was the defending champion, but withdrew before her quarterfinal match with a knee injury.
Monica Niculescu was the defending champion, but she lost in the quarterfinals to Yanina Wickmayer.
Sloane Stephens was the defending champion, but lost in the first round to Risa Ozaki.
Petra Kvitová was the defending champion, but lost in the first round to Peng Shuai.
Alison Van Uytvanck was the defending champion, but chose not to participate.
