2013 Nottingham Challenge – Men's singles

Grega Žemlja was the defending champion, but chose to compete in the 2013 Birmingham Championship instead. Steve Johnson won the final 7–5, 7–5 against Ruben Bemelmans.

Seeds
• # 🇷🇺 Alex Bogomolov Jr. (first round, retired)

• # 🇦🇷 Martín Alund (first round)

• # 🇨🇦 Vasek Pospisil (second round)

• # 🇺🇸 Tim Smyczek (first round)

• # 🇺🇸 Jack Sock (second round)

• # 🇺🇦 Illya Marchenko (quarterfinals)

• # 🇦🇺 Matthew Ebden (second round)

• # 🇯🇵 Go Soeda (quarterfinals)