# 2008 US Open – Boys' singles

Ričardas Berankis was the defending champion but, no longer competing in junior tennis, did not defend his title.
Grigor Dimitrov won in the final 6–4, 6–3, against Devin Britton.

## Seeds

* Yang Tsung-hua (semifinals)
* Bernard Tomic (first round)
* Grigor Dimitrov (champion)
* Henri Kontinen (quarterfinals)
* César Ramírez (second round)
* Guillaume Rufin (third round)
* José Pereira (first round)
* Henrique Cunha (first round)
* Ryan Harrison (third round)
* Juan Vazquez-Valenzuela (second round)
* Cedrik-Marcel Stebe (quarterfinals)
* Yuki Bhambri (second round)
* Bradley Klahn (third round)
* Marcelo Arévalo (third round)
* Peerakit Siributwong (third round)
* (withdrew)

## 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 |
| 1 | Yang Tsung-hua | 6 | 6$^5$ | 6 | | | | | | | | | |
| WC | Rhyne Williams | 3 | 7$^7$ | 3 | | | | | | | | | |
| WC | Rhyne Williams | 3 | 7$^7$ | 3 | 1 | Yang Tsung-hua | 3 | 7 | 2 | | | | |
| | | | | | 3 | Grigor Dimitrov | 6 | 5 | 6 | | | | |
| 3 | Grigor Dimitrov | 6 | 6 | | 3 | Grigor Dimitrov | 6 | 5 | 6 | | | | |
| | Chase Buchanan | 4 | 3 | | | | | | | | | | |
| | Chase Buchanan | 4 | 3 | | | | | | | 3 | Grigor Dimitrov | 6 | 6 |
| | | | | | | | | | | Q | Devin Britton | 4 | 3 |
| | Filip Krajinović | 7$^8$ | 7$^7$ | | | | | | | | | | | Q | Devin Britton | 4 | 3 |
| 4 | Henri Kontinen | 6$^6$ | 6$^5$ | | | | | | | | | | |
| 4 | Henri Kontinen | 6$^6$ | 6$^5$ | | | Filip Krajinović | 6 | 4 | 2 | | | | |
| | | | | | Q | Devin Britton | 1 | 6 | 6 | | | | |
| 11 | Cedrik-Marcel Stebe | 3 | 6 | 3 | Q | Devin Britton | 1 | 6 | 6 | | | | |
| Q | Devin Britton | 6 | 3 | 6 | | | | | | | | | |

### 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 | Tsung-hua Yang | 7$^8$ | 6 | | | | | | | | | | | | | | | | |
| | Nikolaus Moser | 6$^6$ | 4 | | 1 | T-h Yang | 6 | 6 | | | | | | | | | | | |
| WC | Raymond Sarmiento | 6$^3$ | 6$^3$ | | Q | D Schultz | 1 | 1 | | | | | | | | | | | |
| Q | Dominik Schultz | 7$^7$ | 7$^7$ | | | | | | | 1 | T-h Yang | 3 | 6 | 6 | | | | | |
| | Daniel Smethurst | 1 | 7 | 7 | | | | | | 15 | P Siributwong | 6 | 2 | 1 | | | | | |
| WC | Evan King | 6 | 5 | 5 | | D Smethurst | 3 | 2 | | | | | | | | | | | |
| | Mirza Bašić | 4 | 3 | | 15 | P Siributwong | 6 | 6 | | | | | | | | | | | |
| 15 | Peerakit Siributwong | 6 | 6 | | | | | | | | | | | | 1 | T-h Yang | 6 | 6$^5$ | 6 |
| 9 | Ryan Harrison | 6 | 6 | | | | | | | | | | | | WC | R Williams | 3 | 7$^7$ | 3 |
| | Adrien Puget | 3 | 2 | | 9 | R Harrison | 6 | 3 | 6 | | | | | | | | | | |
| Q | Hiroyasu Ehara | 6 | 7 | | Q | H Ehara | 1 | 6 | 2 | | | | | | | | | | |
| LL | James Seal | 2 | 5 | | | | | | | 9 | R Harrison | 7$^7$ | 5 | 3 | | | | | |
| WC | Rhyne Williams | 6 | 6 | | | | | | | WC | R Williams | 6$^5$ | 7 | 6 | | | | | |
| | Borut Puc | 2 | 4 | | WC | R Williams | 7 | 7$^7$ | | | | | | | | | | | |
| | Marin Draganja | 2 | 4 | | 5 | C Ramírez | 5 | 6$^2$ | | | | | | | | | | | |
| 5 | César Ramírez | 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 3 | Grigor Dimitrov | 6 | 6 | | | | | | | | | | | | | | |
| Q | Julien Obry | 2 | 2 | | 3 | G Dimitrov | 7 | 6 | | | | | | | | | |
| | Ty D Trombetta | 6 | 6 | | | T D Trombetta | 5 | 1 | | | | | | | | | |
| | Juan-Carlos Spir | 3 | 1 | | | | | | | 3 | G Dimitrov | 6 | 6 | | | | |
| Q | José Hernández | 2 | 2 | | | | | | | 14 | M Arévalo | 3 | 4 | | | | |
| | Matt Reid | 6 | 6 | | | M Reid | 6 | 5 | 4 | | | | | | | | |
| LL | Richard Becker | 4 | 4 | | 14 | M Arévalo | 1 | 7 | 6 | | | | | | | | |
| 14 | Marcelo Arévalo | 6 | 6 | | | | | | | | | | | 3 | G Dimitrov | 6 | 6 |
| 10 | Juan Vazquez-Valenzuela | 6 | 6 | | | | | | | | | | | | C Buchanan | 4 | 3 |
| | Tennys Sandgren | 4 | 2 | | 10 | J Vazquez-Valenzuela | 1 | 0 | | | | | | | | | |
| | Mikhail Biryukov | 4 | 2 | | | C Buchanan | 6 | 6 | | | | | | | | | |
| | Chase Buchanan | 6 | 6 | | | | | | | | C Buchanan | 6 | 7$^9$ | | | | |
| | Alessandro Giannessi | 6 | 6$^5$ | 7$^7$ | | | | | | | D Cox | 3 | 6$^7$ | | | | |
| Q | Harry Fowler | 4 | 7$^7$ | 6$^3$ | | A Giannessi | 0 | 1 | | | | | | | | | |
| | Daniel Cox | 5 | 7$^7$ | 6 | | D Cox | 6 | 6 | | | | | | | | | |
| 8 | Henrique Cunha | 7 | 6$^1$ | 4 | | | | | | | | | | | | | |

### 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 6 | Guillaume Rufin | 6 | 6 | | | | | | | | | | | | | | |
| | Blaz Rola | 1 | 1 | | 6 | G Rufin | 3 | 7 | 6 | | | | | | | | |
| | Dane Propoggia | 0 | 2 | | | M Willis | 6 | 5 | 4 | | | | | | | | |
| | Marcus Willis | 6 | 6 | | | | | | | 6 | G Rufin | 4 | 6$^3$ | | | | |
| | Filip Krajinović | 6$^5$ | 6 | 4 | | | | | | | F Krajinović | 6 | 7$^7$ | | | | |
| | Jarmere Jenkins | 7$^7$ | 4 | 0$^r$ | | F Krajinović | 7$^7$ | 6 | | | | | | | | | |
| WC | Denis Kudla | 2 | 7 | 3 | 12 | Y Bhambri | 6$^5$ | 4 | | | | | | | | | |
| 12 | Yuki Bhambri | 6 | 5 | 6 | | | | | | | | | | | F Krajinović | 7$^8$ | 7$^7$ |
| LL | Alex Llompart | 6 | 3 | 6 | | | | | | | | | | 4 | H Kontinen | 6$^6$ | 6$^5$ |
| WC | Christian Harrison | 4 | 6 | 3 | LL | A Llompart | 7 | 6 | | | | | | | | | |
| WC | Jordan Cox | 6 | 7$^9$ | | WC | J Cox | 5 | 2 | | | | | | | | | |
| LL | Yannik Reuter | 4 | 6$^7$ | | | | | | | LL | A Llompart | 3 | 1 | | | | |
| | Dino Marcan | 6 | 6 | | | | | | | 4 | H Kontinen | 6 | 6 | | | | |
| | Karim-Mohamed Maamoun | 2 | 2 | | | D Marcan | 3 | 7$^7$ | 3 | | | | | | | | |
| Q | Takanyi Garanganga | 6$^7$ | 3 | | 4 | H Kontinen | 6 | 6$^5$ | 6 | | | | | | | | |
| 4 | Henri Kontinen | 7$^9$ | 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 |
| 7 | José Pereira | 2 | 3 | | | | | | | | | | | | | | | | |
| | Guido Pella | 6 | 6 | | | G Pella | 6 | 6 | | | | | | | | | | | |
| | Di Wun | 6 | 6 | | | D Wun | 3 | 1 | | | | | | | | | | | |
| | Tristan-Samuel Weissborn | 3 | 4 | | | | | | | | G Pella | 0 | 7 | 1 | | | | | |
| WC | Alexander Domijan | 7$^7$ | 6 | | | | | | | 11 | C-M Stebe | 6 | 5 | 6 | | | | | |
| | Kittipong Wachiramanowong | 6$^3$ | 4 | | WC | A Domijan | 3 | 6 | 3 | | | | | | | | | | |
| | Cheng-peng Hsieh | 3 | 2 | | 11 | C-M Stebe | 6 | 4 | 6 | | | | | | | | | | |
| 11 | Cedrik-Marcel Stebe | 6 | 6 | | | | | | | | | | | | 11 | C-M Stebe | 3 | 6 | 3 |
| 13 | Bradley Klahn | 6 | 6 | | | | | | | | | | | | Q | D Britton | 6 | 3 | 6 |
| | Pablo Carreno-Busta | 4 | 3 | | 13 | B Klahn | 4 | 6 | 6 | | | | | | | | | | |
| WC | Robert Johannes Van Overbeek | 2 | 5 | | | C Rungkat | 6 | 1 | 3 | | | | | | | | | | |
| | Christopher Rungkat | 6 | 7 | | | | | | | 13 | B Klahn | 4 | 3 | | | | | | |
| | Giacomo Miccini | 5 | 4 | | | | | | | Q | D Britton | 6 | 6 | | | | | | |
| Q | Matthew Kandath | 7 | 6 | | Q | M Kandath | 1 | 4 | | | | | | | | | | | |
| Q | Devin Britton | 3 | 6 | 6 | Q | D Britton | 6 | 6 | | | | | | | | | | | |
| 2 | Bernard Tomic | 6 | 3 | 2 | | | | | | | | | | | | | | | |