title: 2004 AIG Japan Open Tennis Championships – Women's singles
text: # 2004 AIG Japan Open Tennis Championships – Women's singles
  
  Maria Sharapova was the defending champion and successfully defender her title, by defeating Mashona Washington 6–0, 6–1 in the final.
  
  ## Seeds
  
  The first two seeds received a bye into the second round.
  
  * Maria Sharapova (champion)
  * Tatiana Golovin (second round)
  * Shinobu Asagoe (first round)
  * Kristina Brandi (second round)
  * Meghann Shaughnessy (first round)
  * Nicole Pratt (first round)
  * Klára Koukalová (semifinals)
  * Arantxa Parra Santonja (first round)
  
  ## Draw
  
  ### Key
  
  * Q = Qualifier
  * WC = Wild card
  * LL = Lucky loser
  * Alt = Alternate
  * SE = Special exempt
  * PR = Protected ranking
  * ITF = ITF entry
  * JE = Junior exempt
  * w/o = Walkover
  * r = Retired
  * d = Defaulted
  * SR = Special ranking
  
  ### Finals
  
  | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
  | - | - | - | - | - | - | - | - | - |
  | 1 | Maria Sharapova | 6 | 6 | | | | | |
  | | Tamarine Tanasugarn | 2 | 3 | | | | | |
  | | Tamarine Tanasugarn | 2 | 3 | | 1 | Maria Sharapova | 6 | 6 |
  | | | | | | | Mashona Washington | 0 | 1 |
  | | Mashona Washington | 3 | 7 | 6 | | Mashona Washington | 0 | 1 |
  | 7 | Klára Koukalová | 6 | 5 | 2 | | | | |
  
  ### Top half
  
  | First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
  | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
  | | | | | | 1 | M Sharapova | 6 | 1 | 6 | | | | | | | | |
  | | A Nakamura | 3 | 5 | | Q | S Stosur | 4 | 6 | 3 | | | | | | | | |
  | Q | S Stosur | 6 | 7 | | | | | | | 1 | M Sharapova | 6 | 6 | | | | |
  | | K Srebotnik | 5 | 0 | | | | | | | Q | Y Fedossova | 3 | 4 | | | | |
  | | A Morigami | 7 | 6 | | | A Morigami | 3 | $6^7$ | | | | | | | | | |
  | Q | Y Fedossova | 7 | $7^7$ | | Q | Y Fedossova | 6 | $7^9$ | | | | | | | | | |
  | 5 | M Shaughnessy | 5 | $6^5$ | | | | | | | | | | | 1 | M Sharapova | 6 | 6 |
  | 3 | S Asagoe | 0 | 4 | | | | | | | | | | | | T Tanasugarn | 2 | 3 |
  | | T Tanasugarn | 6 | 6 | | | T Tanasugarn | 6 | $7^7$ | | | | | | | | | |
  | | B Strýcová | 5 | 6 | 4 | | J Craybas | 3 | $6^2$ | | | | | | | | | |
  | | J Craybas | 7 | 4 | 6 | | | | | | | T Tanasugarn | 6 | 3 | | | | |
  | Q | S Pe'er | 6 | 0 | 2 | | | | | | | A Kapros | 1 | $0^r$ | | | | |
  | | A Kapros | 2 | 6 | 6 | | A Kapros | 6 | 6 | | | | | | | | | |
  | Q | S Karatantcheva | 6 | 6 | | Q | S Karatantcheva | 4 | 0 | | | | | | | | | |
  | 8 | A Parra Santonja | 2 | 4 | | | | | | | | | | | | | | |
  
  ### Bottom half
  
  | First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
  | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
  | 6 | N Pratt | 0 | 6 | 4 | | | | | | | | | | | | | | |
  | | E Linetskaya | 6 | 1 | 6 | | E Linetskaya | 6 | 7 | | | | | | | | | | |
  | WC | R Fujiwara | 6 | 6 | | WC | R Fujiwara | 4 | 5 | | | | | | | | | | |
  | | S Obata | 4 | 4 | | | | | | | | E Linetskaya | 2 | 1 | | | | | |
  | | M Sánchez Lorenzo | 2 | 4 | | | | | | | | M Washington | 6 | 6 | | | | | |
  | | M Washington | 6 | 6 | | | M Washington | 6 | 6 | | | | | | | | | | |
  | | S Kleinová | 6 | 3 | 4 | 4 | K Brandi | 2 | 2 | | | | | | | | | | |
  | 4 | K Brandi | 4 | 6 | 6 | | | | | | | | | | | M Washington | 3 | 7 | 6 |
  | 7 | K Koukalová | 6 | 6 | | | | | | | | | | | 7 | K Koukalová | 6 | 5 | 2 |
  | | M Sequera | 2 | 2 | | 7 | K Koukalová | 6 | 6 | | | | | | | | | | |
  | | Ľ Kurhajcová | $7^7$ | 6 | | | Ľ Kurhajcová | 2 | 4 | | | | | | | | | | |
  | | A Jidkova | $6^5$ | 2 | | | | | | | 7 | K Koukalová | 6 | 6 | | | | | |
  | | Y-j Cho | 3 | 4 | | | | | | | WC | N Vaidišová | 3 | 0 | | | | | |
  | WC | N Vaidišová | 6 | 6 | | WC | N Vaidišová | 6 | 3 | 6 | | | | | | | | | |
  | | | | | | 2 | T Golovin | 4 | 6 | 4 | | | | | | | | | |
  