1999 WTA German Open – Singles

Martina Hingis defeated Julie Halard-Decugis in the final, 6–0, 6–1 to win the singles tennis title at the 1999 WTA German Open.

Conchita Martínez was the defending champion, but lost in the third round to Arantxa Sánchez Vicario.

Seeds
The top eight seeds received a bye to the second round. • # Martina Hingis (champion)

• # 🇨🇿 Jana Novotná (second round)

• # 🇩🇪 Steffi Graf (quarterfinals)

• # 🇪🇸 Arantxa Sánchez Vicario (semifinals)

• # n.a.

• # 🇫🇷 Nathalie Tauziat (third round)

• # 🇺🇸 Serena Williams (quarterfinals, retired)

• # Patty Schnyder (quarterfinals)

• # 🇷🇺 Anna Kournikova (first round)

• # Amanda Coetzer (first round)

• # 🇧🇪 Dominique Van Roost (second round)

• # 🇫🇷 Amélie Mauresmo (third round)

• # 🇷🇴 Irina Spîrlea (first round, retired)

• # 🇪🇸 Conchita Martínez (third round)

• # 🇧🇾 Natasha Zvereva (first round)

• # 🇦🇹 Barbara Schett (quarterfinals)

Seeds
• # Emmanuelle Gagliardi (qualifier)

• # Amanda Hopmans (qualifying competition, lucky loser)

• # 🇦🇷 Mariana Díaz Oliva (qualifying competition, lucky loser)

• # 🇦🇺 Alicia Molik (first round)

• # Larisa Neiland (first round)

• # 🇷🇺 Evgenia Kulikovskaya (first round)

• # 🇨🇿 Sandra Kleinová (qualifier)

• # 🇨🇦 Sonya Jeyaseelan (first round)

Qualifiers
• # Emmanuelle Gagliardi

• # 🇨🇿 Sandra Kleinová

• # Sandra Naćuk

• # 🇺🇸 Sandra Cacic

• # 🇮🇹 Germana Di Natale

• # 🇩🇪 Sandra Klösel

• # 🇩🇪 Miriam Schnitzer

• # 🇩🇪 Anca Barna

Lucky losers
• # 🇦🇷 Mariana Díaz Oliva

• # 🇦🇷 Florencia Labat

• # 🇧🇬 Pavlina Stoyanova

• # Amanda Hopmans