1999 ATP Tour World Championships – Singles

Pete Sampras defeated Andre Agassi in the final, 6–1, 7–5, 6–4 to win the singles tennis title at the 1999 Tennis Masters Cup. It was his fifth and last Tour Finals title.

Àlex Corretja was the reigning champion, but did not qualify.

Seeds
• # 🇺🇸 Andre Agassi (final)

• # 🇷🇺 Yevgeny Kafelnikov (semifinals)

• # 🇧🇷 Gustavo Kuerten (round robin)

• # 🇸🇪 Thomas Enqvist (round robin)

• # 🇺🇸 Pete Sampras (champion)

• # 🇩🇪 Nicolas Kiefer (semifinals)

• # 🇺🇸 Todd Martin (round robin)

• # 🇪🇨 Nicolás Lapentti (round robin)

White group
''Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, or of games won; 5. steering-committee decision.''

Red group
''Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, or of games won; 5. steering-committee decision.''