2013 US Open – Boys' singles

Filip Peliwo was the champion the previous year, but could not defend his title as he was no longer eligible to compete in junior tennis. Borna Ćorić won the title, defeating Thanasi Kokkinakis in the final, 3–6, 6–3, 6–1.

Seeds
• # 🇩🇪 Alexander Zverev (semifinals)

• # 🇮🇹 Gianluigi Quinzi (quarterfinals)

• # Christian Garín (semifinals)

• # Borna Ćorić (champion)

• # 🇺🇸 Stefan Kozlov (first round)

• # 🇫🇷 Johan-Sébastien Tatlot (quarterfinals)

• # Guillermo Núñez (first round)

• # 🇯🇵 Yoshihito Nishioka (third round)

• # 🇰🇷 Chung Hyeon (first round)

• # 🇷🇺 Daniil Medvedev (third round)

• # Nicolás Jarry (second round)

• # 🇷🇺 Karen Khachanov (second round)

• # 🇧🇪 Clément Geens (third round)

• # 🇷🇺 Roman Safiullin (second round)

• # 🇵🇪 Jorge Brian Panta (third round)

• # 🇬🇧 Cameron Norrie (first round)