1998 US Open – Boys' singles

Arnaud Di Pasquale was the defending champion, but did not compete this year.

David Nalbandian won the title by defeating Roger Federer 6–3, 7–5 in the final.

Seeds
• # 🇫🇷 Julien Jeanpierre (third round)

• # Fernando González (quarterfinals)

• # 🇸🇪 Andreas Vinciguerra (first round)

• # Roger Federer (final)

• # 🇦🇷 Guillermo Coria (first round)

• # Cheng Wei-jen (third round)

• # 🇧🇷 Flávio Saretta (first round)

• # 🇵🇰 Aisam-ul-Haq Qureshi (first round)

• # 🇺🇸 Taylor Dent (third round)

• # 🇦🇷 David Nalbandian (champion)

• # 🇻🇪 José de Armas (first round)

• # 🇨🇿 Ladislav Chramosta (first round)

• # 🇧🇪 Olivier Rochus (third round)

• # Lovro Zovko (semifinals)

• # 🇨🇮 Valentin Sanon (third round)

• # 🇮🇱 Andy Ram (quarterfinals)