# 2009 US Open – Girls' singles

The United States Open Tennis Championships is a hardcourt tennis tournament held annually at Flushing Meadows, starting on the last Monday in August and lasting for two weeks. The tournament consists of five main championship events: men's and women's singles, men's and women's doubles, and mixed doubles, with additional tournaments for seniors, juniors, and wheelchair players.
In 2009, the girls' singles event was won by Heather Watson of the United Kingdom who beat Yana Buchina of Russia, 6–4, 6–1 in the final.

## Seeds

* Kristina Mladenovic (first round)
* Noppawan Lertcheewakarn (quarterfinals)
* Tímea Babos (second round)
* Sloane Stephens (third round)
* Ajla Tomljanović (second round)
* Silvia Njirić (third round)
* Lauren Embree (second round)
* Christina McHale (withdrew)
* Daria Gavrilova (semifinals)
* Richèl Hogenkamp (third round)
* Heather Watson (champion)
* Tamaryn Hendler (third round)
* Miyabi Inoue (first round)
* Jana Čepelová (quarterfinals)
* Ulrikke Eikeri (third round)
* Beatrice Capra (quarterfinals)

## 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

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 16 | Beatrice Capra | 4 | 6 | 4 | | | | | | | | | |
| | Yana Buchina | 6 | 2 | 6 | | | | | | | | | |
| | Yana Buchina | 6 | 2 | 6 | | Yana Buchina | 1 | 6 | 7 | | | | |
| | | | | | | Laura Robson | 6 | 3 | 5 | | | | |
| WC | Lauren Davis | 2 | 3 | | | Laura Robson | 6 | 3 | 5 | | | | |
| | Laura Robson | 6 | 6 | | | | | | | | | | |
| | Laura Robson | 6 | 6 | | | | | | | | Yana Buchina | 4 | 1 |
| | | | | | | | | | | 11 | Heather Watson | 6 | 6 |
| 9 | Daria Gavrilova | 6 | 6 | | | | | | | | | | | 11 | Heather Watson | 6 | 6 |
| 14 | Jana Čepelová | 4 | 4 | | | | | | | | | | |
| 14 | Jana Čepelová | 4 | 4 | | 9 | Daria Gavrilova | 3 | 0 | | | | | |
| | | | | | 11 | Heather Watson | 6 | 6 | | | | | |
| 11 | Heather Watson | 6 | 6 | | 11 | Heather Watson | 6 | 6 | | | | | |
| 2 | Noppawan Lertcheewakarn | 2 | 1 | | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 1 | Kristina Mladenovic | 1 | 4 | | | | | | | | | | | | | | | | |
| WC | Asia Muhammad | 6 | 6 | | WC | A Muhammad | 6 | 6 | | | | | | | | | | | |
| WC | Gail Brodsky | 7 | 7 | | WC | G Brodsky | 3 | 4 | | | | | | | | | | | |
| | Verónica Cepede Royg | 5 | 5 | | | | | | | WC | A Muhammad | 6 | 1 | 1 | | | | | |
| SE | Gabriela Dabrowski | 2 | 4 | | | | | | | 16 | B Capra | 3 | 6 | 6 | | | | | |
| | Anna Orlik | 6 | 6 | | | A Orlik | 7 | 4 | 3 | | | | | | | | | | |
| Q | Anna Arina Marenko | 3 | 2 | | 16 | B Capra | 5 | 6 | 6 | | | | | | | | | | |
| 16 | Beatrice Capra | 6 | 6 | | | | | | | | | | | | 16 | B Capra | 4 | 6 | 4 |
| 10 | Richèl Hogenkamp | 6 | 6$^5$ | 6 | | | | | | | | | | | | Y Buchina | 6 | 2 | 6 |
| | Paula Ormaechea | 2 | 7$^7$ | 2 | 10 | R Hogenkamp | 6 | 6 | | | | | | | | | | | |
| WC | Grace Min | 6 | 6 | | WC | G Min | 1 | 4 | | | | | | | | | | | |
| Q | Juan Ting-fei | 4 | 2 | | | | | | | 10 | R Hogenkamp | 5 | 0 | | | | | | |
| | Stephanie Cornish | 4 | 6$^5$ | | | | | | | | Y Buchina | 7 | 6 | | | | | | |
| | Yana Buchina | 6 | 7$^7$ | | | Y Buchina | 3 | 6 | 6 | | | | | | | | | | |
| WC | Alexandra Cercone | 1 | 3 | | 5 | A Tomljanović | 6 | 3 | 3 | | | | | | | | | | |
| 5 | Ajla Tomljanović | 6 | 6 | | | | | | | | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 3 | Tímea Babos | 6 | 6 | | | | | | | | | | | | | | | |
| | Elina Svitolina | 3 | 4 | | 3 | T Babos | 6 | 6$^3$ | 4 | | | | | | | | | |
| | Irina Khromacheva | 4 | 4 | | WC | L Davis | 1 | 7 | 6 | | | | | | | | | |
| WC | Lauren Davis | 6 | 6 | | | | | | | WC | L Davis | 6 | 2 | 7 | | | | |
| Q | Luksika Kumkhum | 4 | 6 | 7 | | | | | | | E Bogdan | 2 | 6 | 5 | | | | |
| WC | Ester Goldfeld | 6 | 0 | 5 | Q | L Kumkhum | 5 | 5 | | | | | | | | | | |
| | Elena Bogdan | 6 | 6 | | | E Bogdan | 7 | 7 | | | | | | | | | | |
| 13 | Miyabi Inoue | 0 | 0 | | | | | | | | | | | | WC | L Davis | 2 | 3 |
| 12 | Tamaryn Hendler | 6 | 6 | | | | | | | | | | | | | L Robson | 6 | 6 |
| WC | Jacqueline Cako | 4 | 2 | | 12 | T Hendler | 6 | 6 | | | | | | | | | | |
| | Anna-Lena Friedsam | 4 | 4 | | | Y Putintseva | 4 | 4 | | | | | | | | | | |
| | Yulia Putintseva | 6 | 6 | | | | | | | 12 | T Hendler | 2 | 1 | | | | | |
| | Laura Robson | 6 | 6 | | | | | | | | L Robson | 6 | 6 | | | | | |
| | Ons Jabeur | 0 | 1 | | | L Robson | 4 | 6 | 6 | | | | | | | | | |
| Q | Paula Kania | 5 | 2 | | 7 | L Embree | 6 | 1 | 4 | | | | | | | | | |
| 7 | Lauren Embree | 7 | 6 | | | | | | | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 6 | Silvia Njirić | 6 | 7 | | | | | | | | | | | | | | | |
| | Tamara Čurović | 4 | 5 | | 6 | S Njirić | 6$^3$ | 6 | 7$^7$ | | | | | | | | | |
| Q | Noel Scott | 4 | 0 | | | Zs Susányi | 7$^7$ | 4 | 6$^3$ | | | | | | | | | |
| | Zsófia Susányi | 6 | 6 | | | | | | | 6 | S Njirić | 4 | 6 | | | | | |
| | Alejandra Granillo | 4 | 2 | | | | | | | 9 | D Gavrilova | 6 | 7 | | | | | |
| | Grace Sari Ysidora | 6 | 6 | | | GS Ysidora | 1 | 6$^3$ | | | | | | | | | | |
| | Mallory Burdette | 6 | 2 | 3 | 9 | D Gavrilova | 6 | 7$^7$ | | | | | | | | | | |
| 9 | Daria Gavrilova | 2 | 6 | 6 | | | | | | | | | | | 9 | D Gavrilova | 6 | 6 |
| 14 | Jana Čepelová | 6 | 7 | | | | | | | | | | | | 14 | J Čepelová | 4 | 4 |
| | Katarena Paliivets | 3 | 5 | | 14 | J Čepelová | 6 | 6 | | | | | | | | | | |
| | Zheng Saisai | 3 | 7$^7$ | 1 | WC | J Boserup | 4 | 3 | | | | | | | | | | |
| WC | Julia Boserup | 6 | 6$^5$ | 6 | | | | | | 14 | J Čepelová | 4 | 6 | 6 | | | | |
| Q | Akiko Omae | 3 | 6 | 3 | | | | | | 4 | S Stephens | 6 | 1 | 0 | | | | |
| | Maryna Zanevska | 6 | 4 | 6 | | M Zanevska | 6$^4$ | 6 | 2 | | | | | | | | | |
| | Polina Leykina | 4 | 2 | | 4 | S Stephens | 7$^7$ | 3 | 6 | | | | | | | | | |
| 4 | Sloane Stephens | 6 | 6 | | | | | | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| LL | Annika Beck | 6 | 6$^6$ | 6 | | | | | | | | | | | | | | |
| | Fatma Al-Nabhani | 3 | 7$^8$ | 1 | LL | A Beck | 6 | 6 | | | | | | | | | | |
| Q | Risa Ozaki | 6 | 6$^4$ | 2 | | M Grage | 3 | 3 | | | | | | | | | | |
| | Mai Grage | 3 | 7$^7$ | 6 | | | | | | LL | A Beck | 4 | 5 | | | | | |
| Q | Courtney Dolehide | 6 | 4 | 6 | | | | | | 11 | H Watson | 6 | 7 | | | | | |
| | Cristina Dinu | 0 | 6 | 4 | Q | C Dolehide | 3 | 2 | | | | | | | | | | |
| | Ksenia Kirillova | 2 | 7$^7$ | 1 | 11 | H Watson | 6 | 6 | | | | | | | | | | |
| 11 | Heather Watson | 6 | 6$^5$ | 6 | | | | | | | | | | | 11 | H Watson | 6 | 6 |
| 15 | Ulrikke Eikeri | 6 | 6 | | | | | | | | | | | | 2 | N Lertcheewakarn | 2 | 1 |
| | Nataliya Pintusova | 2 | 1 | | 15 | U Eikeri | 6 | 7$^7$ | | | | | | | | | | |
| | Nicole Gibbs | 6 | 6 | | | N Gibbs | 3 | 6$^3$ | | | | | | | | | | |
| | Magda Linette | 4 | 1 | | | | | | | 15 | U Eikeri | 2 | 6 | 1 | | | | |
| | Valeriya Solovyeva | 5 | 6 | 6 | | | | | | 2 | N Lertcheewakarn | 6 | 3 | 6 | | | | |
| | Kristie Ahn | 7 | 2 | 4 | | V Solovyeva | 6 | 4 | 6$^4$ | | | | | | | | | |
| | Sina Haas | 4 | 1 | | 2 | N Lertcheewakarn | 2 | 6 | 7$^7$ | | | | | | | | | |
| 2 | Noppawan Lertcheewakarn | 6 | 6 | | | | | | | | | | | | | | | |