2005 US Open – Boys' singles

The United States Open Tennis Championships is a hardcourt tennis tournament held annually at Flushing Meadows, starting on the last Monday in August and lasting for two weeks. The tournament consists of five main championship events: men's and women's singles, men's and women's doubles, and mixed doubles, with additional tournaments for seniors, juniors, and wheelchair players.

In 2005, Andy Murray was the defending champion in the boys' singles event, but did not complete in Juniors this year. The event was won by Ryan Sweeting of the Bahamas who beat Jérémy Chardy of France, 6–4, 6–4 in the final.

Seeds
• # 🇺🇸 Donald Young (quarterfinals)

• # Marin Čilić (quarterfinals)

• # 🇦🇷 Leonardo Mayer (quarterfinals)

• # 🇨🇴 Santiago Giraldo (semifinals)

• # 🇺🇸 Alex Kuznetsov (third round)

• # 🇰🇷 Kim Sun-yong (semifinals)

• # 🇫🇷 Jérémy Chardy (final)

• # 🇧🇪 Niels Desein (first round)

• # Thiemo de Bakker (second round)

• # 🇺🇸 Timothy Neilly (second round)

• # Petar Jelenić (first round)

• # 🇦🇺 Carsten Ball (first round)

• # 🇺🇸 Sam Querrey (third round)

• # 🇷🇺 Evgeny Kirillov (third round)

• # 🇧🇷 André Miele (first round)

• # 🇺🇸 Jesse Levine (second round)