| Boys' doubles | |
|---|---|
| 2018 US Open | |
| Champions |  Adrian Andreev  Anton Matusevich |
| Runners-up |  Emilio Nava Axel Nefve |
| Score | 6–4, 2–6, [10–8] |
Hsu Yu-hsiou and Wu Yibing were the defending champions, but both players were no longer eligible to participate in junior tournaments.
Adrian Andreev and Anton Matusevich won the title, defeating Emilio Nava and Axel Nefve in the final, 6–4, 2–6, [10–8].
Thiago Seyboth Wild / 
Tseng Chun-hsin (first round)
Sebastián Báez / Facundo Díaz Acosta (first round)
Hugo Gaston / Clément Tabur (second round) Aidan McHugh / 
Timofei Skatov (first round)
Carlos López Montagud / 
Mu Tao (first round) Tristan Boyer / 
Nick Hardt (second round)
Ondřej Štyler / 
Naoki Tajima (first round)
Filip Cristian Jianu / 
Deney Wassermann (quarterfinals)| Semifinals | Final | ||||||||||||
 Lorenzo Musetti Giulio Zeppieri | 6 | 5 | [6] | ||||||||||
| Adrian Andreev Anton Matusevich | 4 | 7 | [10] | ||||||||||
| Adrian Andreev Anton Matusevich | 6 | 2 | [10] | ||||||||||
| Emilio Nava Axel Nefve | 4 | 6 | [8] | ||||||||||
Jesper de Jong  Damien Wenger | 6 | 4 | [10] | ||||||||||
| Emilio Nava Axel Nefve | 3 | 6 | [12] | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | Tristan Boyer Nick Hardt | 77 | 6 | ||||||||||||||||||||||||
 Yankı Erel  Otto Virtanen | 65 | 3 | 6 | T Boyer N Hardt | 6 | 3 | [4] | ||||||||||||||||||||
| Drew Baird Trey Hilderbrand | 77 | 6 | D Baird T Hilderbrand | 3 | 6 | [10] | |||||||||||||||||||||
 Nicolás Mejía Tyler Zink | 65 | 4 | D Baird T Hilderbrand | 77 | 1 | [4] | |||||||||||||||||||||
 Arnaud Bovy Jiří Lehečka | 1 | 4 | J de Jong D Wenger | 63 | 6 | [10] | |||||||||||||||||||||
| Jesper de Jong Damien Wenger | 6 | 6 | J de Jong D Wenger | 6 | 7 | ||||||||||||||||||||||
| WC | Jenson Brooksby Stefan Dostanic | 4 | 2 | 3 | H Gaston C Tabur | 3 | 5 | ||||||||||||||||||||
| 3 | Hugo Gaston Clément Tabur | 6 | 6 | J de Jong D Wenger | 6 | 4 | [10] | ||||||||||||||||||||
| 7 | Ondřej Štyler Naoki Tajima | 4 | 5 | E Nava A Nefve | 3 | 6 | [12] | ||||||||||||||||||||
| Nicolás Álvarez Varona Gilbert Soares Klier Júnior | 6 | 7 | N Álvarez Varona G Soares Klier Júnior | 6 | 7 | ||||||||||||||||||||||
| WC | Martin Damm Toby Alex Kodat | 3 | 6 | [9] |  W Marek D Michalski | 4 | 5 | ||||||||||||||||||||
| Wojciech Marek Daniel Michalski | 6 | 3 | [11] | N Álvarez Varona G Soares Klier Júnior | 3 | 6 | [4] | ||||||||||||||||||||
 Philip Henning Dostanbek Tashbulatov | 3 | 4 | E Nava A Nefve | 6 | 3 | [10] | |||||||||||||||||||||
| Arthur Cazaux Harold Mayot | 6 | 6 | A Cazaux H Mayot | 4 | 5 | ||||||||||||||||||||||
| Emilio Nava Axel Nefve | 6 | 78 | E Nava A Nefve | 6 | 7 | ||||||||||||||||||||||
| 2 | Sebastián Báez Facundo Díaz Acosta | 3 | 66 | ||||||||||||||||||||||||
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