| Women's singles | |
|---|---|
| 2004 Idea Prokom Open | |
| Champion |  Flavia Pennetta |
| Runner-up |  Klára Koukalová |
| Final score | 7–5, 3–6, 6–3 |
Anna Smashnova-Pistolesi was the defending champion, but lost in second round to Marta Domachowska.
Flavia Pennetta won the title by defeating Klára Koukalová 7–5, 3–6, 6–3 in the final.
The first two seeds received a bye into the second round.
Anastasia Myskina (semifinals, withdrew)
Anna Smashnova-Pistolesi (second round) Dinara Safina (second round)
Anabel Medina Garrigues (first round) Iveta Benešová (quarterfinals) 
Flavia Pennetta (champion) Marta Marrero (quarterfinals) Klára Koukalová (final)| Semifinals | Final | ||||||||||||
| 1 | Anastasia Myskina | ||||||||||||
| 11 | Klára Koukalová | w/o | |||||||||||
| 11 | Klára Koukalová | 5 | 6 | 3 | |||||||||
| 9 | Flavia Pennetta | 7 | 3 | 6 | |||||||||
| 9 | Flavia Pennetta | 6 | 6 | ||||||||||
| WC |  Marta Domachowska | 2 | 2 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Myskina | 6 | 6 | ||||||||||||||||||||||||
| Z Ondrášková | 3 | 6 | 7 | Z Ondrášková | 2 | 2 | |||||||||||||||||||||
 S Cohen-Aloro | 6 | 1 | 5 | 1 | A Myskina | 6 | 6 | ||||||||||||||||||||
 S Talaja | 6 | 6 | 5 | I Benešová | 3 | 4 | |||||||||||||||||||||
| Q |  S Sfar | 4 | 2 | S Talaja | 6 | 4 | 2 | ||||||||||||||||||||
| WC | M Kiszczyńska | 2 | 3 | 5 | I Benešová | 1 | 6 | 6 | |||||||||||||||||||
| 5 | I Benešová | 6 | 6 | 1 | A Myskina | ||||||||||||||||||||||
| 3 | D Safina | 6 | 6 | 11 | K Koukalová | w/o | |||||||||||||||||||||
| LL | M Paštiková | 4 | 4 | 3 | D Safina | 2 | 4 | ||||||||||||||||||||
 Ľ Kurhajcová | 2 | 6 | 6 | Ľ Kurhajcová | 6 | 6 | |||||||||||||||||||||
| A Canepa | 6 | 4 | 1 | Ľ Kurhajcová | 2 | 1 | |||||||||||||||||||||
| V Dushevina | 6 | 6 | 11 | K Koukalová | 6 | 6 | |||||||||||||||||||||
| LL |  K Bondarenko | 0 | 2 | V Dushevina | 61 | 6 | 4 | ||||||||||||||||||||
| LL | M Müller | 5 | 3 | 11 | K Koukalová | 77 | 3 | 6 | |||||||||||||||||||
| 11 | K Koukalová | 7 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 9 | F Pennetta | 6 | 6 | ||||||||||||||||||||||||
| Q | S Mamić | 1 | 2 | 9 | F Pennetta | 6 | 6 | ||||||||||||||||||||
 B Schwartz | 1 | 2 | LL | L Průšová | 4 | 2 | |||||||||||||||||||||
| LL | L Průšová | 6 | 6 | 9 | F Pennetta | 6 | 77 | ||||||||||||||||||||
| N Llagostera Vives | 6 | 6 | N Llagostera Vives | 2 | 64 | ||||||||||||||||||||||
| Q |  Z Gubacsi | 2 | 0 | N Llagostera Vives | 64 | 6 | 7 | ||||||||||||||||||||
| Ľ Cervanová | 6 | 6 | Ľ Cervanová | 77 | 1 | 5 | |||||||||||||||||||||
| 4 | A Medina Garrigues | 3 | 1 | 9 | F Pennetta | 6 | 6 | ||||||||||||||||||||
| 10 | M Marrero | 6 | 4 | 6 | WC | M Domachowska | 2 | 2 | |||||||||||||||||||
 C Castaño | 2 | 6 | 4 | 10 | M Marrero | 6 | 77 | ||||||||||||||||||||
| Q | E Birnerová | 6 | 6 | Q | E Birnerová | 2 | 64 | ||||||||||||||||||||
| LL | K Jans | 2 | 2 | 10 | M Marrero | 1 | 4 | ||||||||||||||||||||
| WC | M Domachowska | 6 | 6 | WC | M Domachowska | 6 | 6 | ||||||||||||||||||||
| M Suchá | 0 | 2 | WC | M Domachowska | 77 | 6 | |||||||||||||||||||||
| 2 | A Smashnova-Pistolesi | 64 | 1 | ||||||||||||||||||||||||
Serena Williams defeated her sister Venus Williams in the final, 7–6(7–4), 3–6, 6–4 to win the women's singles tennis title at the 2003 Australian Open. It was her fourth consecutive major singles triumph, completing the "Serena Slam", both a non-calendar year Grand Slam and the career Grand Slam. It was also Venus' record fourth consecutive runner-up finish at a major, losing every final to Serena. Serena saved two match points and was 1–5 down in the third set against Kim Clijsters in the semifinals. This marked the first Australian Open final without Martina Hingis since 1996.
Defending champion Justine Henin-Hardenne successfully defended her title, defeating Svetlana Kuznetsova in the final, 6–4, 6–4 to win the women's singles tennis title at the 2006 French Open. She won the title without losing a set during the tournament, or without facing a tiebreak in any set.
Flavia Pennetta won in the final 6–4, 5–4, after Klára Zakopalová retired due to a left ankle injury.
Émilie Loit was the defending champion, but chose not to participate that year.
Two-time defending champion Serena Williams defeated Elena Dementieva in the final, 6–1, 6–1 to win the women's singles tennis title at the 2004 Miami Open.
Kim Clijsters was the defending champion, but lost in the second round to Jill Craybas.
Kim Clijsters was the defending champion, but chose not to participate that year.
Lindsay Davenport was the defending champion, but withdrew due to a lower-back strain.
Ekaterina Makarova and Elena Vesnina were the defending champions, but lost in the second round to Julie Coin and Pauline Parmentier.
Justine Henin was the defending champion, but withdrew due to a virus.
This was the first edition of the tournament, so no defending champions were declared.
Anastasia Pavlyuchenkova was the defending champion, but lost to Svetlana Kuznetsova in the final, 2–6, 1–6.
Klára Koukalová was the defending champion, but lost in second round to Michaëlla Krajicek.
Patty Schnyder was the defending champion, but lost in quarterfinals to Lucie Šafářová.
Zheng Jie was the defending champion, but did not compete this year.
Anabel Medina Garrigues was the 2-time defending champion and successfully defended her title, by defeating Tathiana Garbin 6–4, 6–4 in the final.
Anna Smashnova-Pistolesi was the defending champion, but was forced to retire in her second round match against Sandra Kleinová due to a hamstring injury.
Justine Henin-Hardenne was the defending champion, but withdrew from the tournament due to injury.
Patricia Wartusch was the defending champion, but lost in the second round to Anastasia Rodionova.
Dinara Safina was the defending champion in the Women's Singles event in the 2003 Idea Prokom Open, a Polish tennis competition. She retired in her quarter-final match against Anna Pistolesi.