# 2009 US Open – Boys' singles

Grigor Dimitrov was the defending champion, but did not compete in the Juniors this year.
Bernard Tomic won in the final 6–1, 6–3 against Chase Buchanan.

## Seeds

* Yuki Bhambri (quarterfinals)
* Daniel Berta (first round)
* Bernard Tomic (champion)
* Huang Liang-chi (first round)
* Agustín Velotti (first round)
* Lim Young-kyu (second round)
* Andrea Collarini (third round)
* Gianni Mina (semifinals)
* Shuichi Sekiguchi (first round)
* Facundo Argüello (first round)
* Kevin Krawietz (first round)
* Julien Obry (second round)
* Julen Urigüen (first round)
* David Souto (first round)
* Dominik Schulz (second round)
* Denis Kudla (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 | Final | Final | Final | Final |
| 1 | Yuki Bhambri | 3 | 6$^4$ | | | | | | | | | |
| WC | Chase Buchanan | 6 | 7 | | | | | | | | | |
| WC | Chase Buchanan | 6 | 7 | | WC | Chase Buchanan | 6 | 6 | | | | |
| | | | | | 8 | Gianni Mina | 3 | 3 | | | | |
| 16 | Denis Kudla | 6 | 6 | 3 | 8 | Gianni Mina | 3 | 3 | | | | |
| 8 | Gianni Mina | 2 | 7 | 6 | | | | | | | | |
| 8 | Gianni Mina | 2 | 7 | 6 | | | | | WC | Chase Buchanan | 1 | 3 |
| | | | | | | | | | 3 | Bernard Tomic | 6 | 6 |
| | Tiago Fernandes | 1 | 4 | | | | | | | | | | 3 | Bernard Tomic | 6 | 6 |
| 3 | Bernard Tomic | 6 | 6 | | | | | | | | | |
| 3 | Bernard Tomic | 6 | 6 | | 3 | Bernard Tomic | 6 | 7 | | | | |
| | | | | | | Pierre-Hugues Herbert | 1 | 6$^5$ | | | | |
| | Pierre-Hugues Herbert | 6 | 4 | 6 | | Pierre-Hugues Herbert | 1 | 6$^5$ | | | | |
| WC | Raymond Sarmiento | 2 | 6 | 2 | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 1 | Yuki Bhambri | 6 | 6 | | | | | | | | | | | | | |
| | Jordan Cox | 2 | 1 | | 1 | Y Bhambri | 6 | 6 | | | | | | | | |
| | Patrik Brydolf | 2 | 4 | | | S Ehrat | 0 | 1 | | | | | | | | |
| | Sandro Ehrat | 6 | 6 | | | | | | 1 | Y Bhambri | 6 | 6 | | | | |
| WC | Johannes Robert Van Overbeek | 4 | 3 | | | | | | WC | J Sock | 4 | 3 | | | | |
| | Stanislav Poplavskyy | 6 | 6 | | | S Poplavskyy | 1 | 4 | | | | | | | | |
| WC | Jack Sock | 4 | 6 | 6 | WC | J Sock | 6 | 6 | | | | | | | | |
| 14 | David Souto | 6 | 1 | 4 | | | | | | | | | 1 | Y Bhambri | 3 | 6$^4$ |
| 11 | Kevin Krawietz | 6 | 1 | 5 | | | | | | | | | WC | C Buchanan | 6 | 7 |
| WC | Chase Buchanan | 3 | 6 | 7 | WC | C Buchanan | 6 | 6 | | | | | | | | |
| | Hiroyasu Ehara | 7 | 6 | | | H Ehara | 4 | 4 | | | | | | | | |
| | Adrien Puget | 5 | 1 | | | | | | WC | C Buchanan | 6 | 6 | | | | |
| | Guilherme Clezar | 3 | 4 | | | | | | | M Fucsovics | 2 | 3 | | | | |
| | Márton Fucsovics | 6 | 6 | | | M Fucsovics | 6 | 6 | | | | | | | | |
| | Evan King | 7 | 6 | | | E King | 2 | 3 | | | | | | | | |
| 5 | Agustín Velotti | 6$^4$ | 4 | | | | | | | | | | | | | |

#### 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 | Quarterfinals |
| 4 | Huang Liang-chi | 6$^4$ | 6$^4$ | | | | | | | | | | | | | | | | |
| SE | Matthew Kandath | 7 | 7 | | SE | M Kandath | 3 | 6 | 4 | | | | | | | | | | |
| | Nikala Scholtz | 6$^7$ | 6 | 4 | | A De Greef | 6 | 4 | 6 | | | | | | | | | | |
| | Arthur De Greef | 7 | 4 | 6 | | | | | | | A De Greef | 6 | 3 | 4 | | | | | |
| Q | Mikhail Biryukov | 1 | 6 | 6 | | | | | | 16 | D Kudla | 4 | 6 | 6 | | | | | |
| | Richard Becker | 6 | 3 | 3 | Q | M Biryukov | 5 | 3 | | | | | | | | | | | |
| | Radim Urbánek | 3 | 5 | | 16 | D Kudla | 7 | 6 | | | | | | | | | | | |
| 16 | Denis Kudla | 6 | 7 | | | | | | | | | | | | 16 | D Kudla | 6 | 6 | 3 |
| 10 | Facundo Argüello | 3 | 6 | 2 | | | | | | | | | | | 8 | G Mina | 2 | 7 | 6 |
| Q | Christian Lindell | 6 | 3 | 6 | Q | C Lindell | 4 | 6 | 6 | | | | | | | | | | |
| WC | Shane Vinsant | 1 | 1 | | Q | S-y Jeong | 6 | 3 | 2 | | | | | | | | | | |
| Q | Jeong Suk-young | 6 | 6 | | | | | | | Q | C Lindell | 6$^6$ | 4 | | | | | | |
| | Jozef Kovalík | 6 | 7 | | | | | | | 8 | G Mina | 7 | 6 | | | | | | |
| | Harry Fowler | 4 | 6$^5$ | | | J Kovalík | 7 | 2 | 4 | | | | | | | | | | |
| Q | Yasutaka Uchiyama | 4 | 4 | | 8 | G Mina | 5 | 6 | 6 | | | | | | | | | | |
| 8 | Gianni Mina | 6 | 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 |
| 7 | Andrea Collarini | 6 | 6 | | | | | | | | | | | | | | | |
| WC | Gonzales Austin | 1 | 3 | | 7 | A Collarini | 6 | 6 | | | | | | | | | | |
| | Mitchell Frank | 6 | 5 | 1 | | F Gaio | 4 | 3 | | | | | | | | | | |
| | Federico Gaio | 2 | 7 | 6 | | | | | | 7 | A Collarini | 4 | 5 | | | | | |
| WC | Dennis Novikov | 2 | 1 | | | | | | | | T Fernandes | 6 | 7 | | | | | |
| | Tiago Fernandes | 6 | 6 | | | T Fernandes | 2 | 6 | 6 | | | | | | | | | |
| | Duilio Beretta | 6$^6$ | 3 | | 12 | J Obry | 6 | 4 | 3 | | | | | | | | | |
| 12 | Julien Obry | 7 | 6 | | | | | | | | | | | | | T Fernandes | 1 | 4 |
| 15 | Dominik Schulz | 6 | 6 | | | | | | | | | | | | 3 | B Tomic | 6 | 6 |
| | Francis Casey Alcantara | 3 | 4 | | 15 | D Schulz | 4 | 6 | 3 | | | | | | | | | |
| Q | Tobias Blomgren | 6 | 6 | | Q | T Blomgren | 6 | 3 | 6 | | | | | | | | | |
| WC | Bjorn Fratangelo | 4 | 4 | | | | | | | Q | T Blomgren | 6 | 1 | 2 | | | | |
| | Alexander Domijan | 6 | 3 | 7 | | | | | | 3 | B Tomic | 4 | 6 | 6 | | | | |
| Q | Sudanwa Sitaram | 3 | 6 | 5 | | A Domijan | 6 | 5 | 1 | | | | | | | | | |
| | Henri Laaksonen | 4 | 3 | | 3 | B Tomic | 4 | 7 | 6 | | | | | | | | | |
| 3 | Bernard Tomic | 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 | Quarterfinals |
| 6 | Lim Yong-kyu | 6 | 6 | | | | | | | | | | | | | | | | |
| Q | Maximilian Neuchrist | 2 | 4 | | 6 | Y-k Lim | 6 | 3 | 6$^5$ | | | | | | | | | | |
| | José Pereira | 2 | 6 | 6 | | J Pereira | 2 | 6 | 7 | | | | | | | | | | |
| | Junior Ore | 6 | 4 | 1 | | | | | | | J Pereira | 7 | 6$^1$ | 4 | | | | | |
| | Alexandros Georgoudas | 6 | 3 | 6 | | | | | | | P-H Herbert | 5 | 7 | 6 | | | | | |
| Q | Sekou Bangoura | 4 | 6 | 0 | | A Georgoudas | 2 | 4 | | | | | | | | | | | |
| | Pierre-Hugues Herbert | 3 | 6 | 6 | | P-H Herbert | 6 | 6 | | | | | | | | | | | |
| 9 | Shuichi Sekiguchi | 6 | 3 | 2 | | | | | | | | | | | | P-H Herbert | 6 | 4 | 6 |
| 13 | Julen Urigüen | 3 | 3 | | | | | | | | | | | | WC | R Sarmiento | 2 | 6 | 2 |
| | Filip Horanský | 6 | 6 | | | F Horanský | 6$^2$ | 1 | | | | | | | | | | | |
| WC | Raymond Sarmiento | 7 | 6 | | WC | R Sarmiento | 7 | 6 | | | | | | | | | | | |
| | Hsieh Cheng-peng | 5 | 3 | | | | | | | WC | R Sarmiento | 7 | 2 | 6 | | | | | |
| | Renzo Olivo | 5 | 1 | | | | | | | | S Lavie | 6 | 6 | 1 | | | | | |
| | Sebastian Lavie | 7 | 6 | | | S Lavie | 7 | 7 | | | | | | | | | | | |
| | Tennys Sandgren | 4 | 6 | 7 | | T Sandgren | 6$^4$ | 6$^5$ | | | | | | | | | | | |
| 2 | Daniel Berta | 6 | 3 | 6$^5$ | | | | | | | | | | | | | | | |