2004 Tennis Masters Cup – Singles

Defending champion Roger Federer defeated Lleyton Hewitt in the final, 6–3, 6–2 to win the singles tennis title at the 2004 Tennis Masters Cup. It was his second Tour Finals title.

Seeds
• # Roger Federer (champion)

• # 🇺🇸 Andy Roddick (semifinals)

• # 🇦🇺 Lleyton Hewitt (final)

• # 🇷🇺 Marat Safin (semifinals)

• # 🇪🇸 Carlos Moyá (round robin)

• # 🇦🇷 Guillermo Coria (round robin)

• # 🇬🇧 Tim Henman (round robin)

• # 🇦🇷 Gastón Gaudio (round robin)

Alternate
• # 🇦🇷 Guillermo Cañas (Did not play)

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.''

Blue 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.''