2001 Tennis Masters Cup – Singles

Lleyton Hewitt defeated Sébastien Grosjean in the final, 6–3, 6–3, 6–4 to win the singles tennis title at the 2001 Tennis Masters Cup. With his round-robin victory against Pat Rafter, Hewitt secured the year-end world No. 1 ranking for the first time. Gustavo Kuerten and Andre Agassi were in contention for the number 1 ranking before the tournament.

Kuerten was the defending champion, but was eliminated in the round-robin stage.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.

• # 🇧🇷 Gustavo Kuerten (round robin)

• # 🇦🇺 Lleyton Hewitt (champion)

• # 🇺🇸 Andre Agassi (round robin)

• # 🇪🇸 Juan Carlos Ferrero (semifinals)

• # 🇷🇺 Yevgeny Kafelnikov (semifinals)

• # 🇦🇺 Patrick Rafter (round robin)

• # 🇫🇷 Sébastien Grosjean (final)

• # Goran Ivanišević (round robin)

Alternate
• # 🇩🇪 Tommy Haas (Did not play)

Rosewall 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.''

Newcombe 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.''