2009 WTA Tour Championships – Singles
| Singles | |
|---|---|
| 2009 WTA Tour Championships | |
| Champion |
 Serena Williams
|
| Runner-up |
Venus Williams
|
| Final score | 6–2, 7–6(7–4) |
Venus Williams was the defending champion, but lost to her sister Serena Williams in the final, 6–2, 7–6(7–4). With the victory, Serena claimed the year-end No. 1 ranking for the second time in her career.
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.
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.
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