2005 WTA Tour Championships – Singles

Amélie Mauresmo defeated Mary Pierce in the final, 5–7, 7–6(7–3), 6–4 to win the singles tennis title at the 2005 WTA Tour Championships.

Maria Sharapova was the defending champion, but lost in the semifinals to Mauresmo.

Seeds
• # (1) 🇺🇸 Lindsay Davenport (semifinals)

• # (2) 🇧🇪 Kim Clijsters (round robin)

• # (3) 🇷🇺 Maria Sharapova (semifinals)

• # (4) 🇫🇷 Amélie Mauresmo (champion)

• # (5) 🇫🇷 Mary Pierce (final)

• # (8) Patty Schnyder (round robin)

• # (9) 🇷🇺 Nadia Petrova (round robin)

• # (10) 🇷🇺 Elena Dementieva (round robin) Note:
 * 🇧🇪 Justine Henin-Hardenne had qualified but pulled out due a hamstring injury.

Alternates
• # 🇺🇸 Venus Williams (not used)

• # 🇫🇷 Nathalie Dechy (not used)

Black 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.''

Green 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.''