1999 WTA Tour Championships – Singles

Lindsay Davenport defeated the defending champion Martina Hingis in a rematch of the previous year's final, 6–4, 6–2 to win the singles tennis title at the 1999 WTA Tour Championships.

Seeds
• # Martina Hingis (final)

• # 🇺🇸 Lindsay Davenport (champion)

• # 🇺🇸 Venus Williams (semifinals)

• # 🇺🇸 Serena Williams (withdrew, retired due to back injury during practice)

• # 🇫🇷 Mary Pierce (quarterfinals)

• # 🇫🇷 Nathalie Tauziat (semifinals)

• # 🇦🇹 Barbara Schett (quarterfinals)

• # 🇫🇷 Julie Halard-Decugis (first round) Notes:
 * 🇺🇸 Monica Seles had qualified but pulled out due to right foot stress fracture

Alternates

 * 1) 🇷🇺 Elena Likhovtseva (replaced Serena Williams, defeated in first round)