2013 Knoxville Challenger – Singles

Michael Russell was the defending champion, but retired against Tennys Sandgren in the quarterfinals. Top seed Tim Smyczek won the title defeating unseeded Canadian Peter Polansky in the final.

Seeds
• # 🇺🇸 Tim Smyczek (champion)

• # 🇺🇸 Denis Kudla (first round)

• # 🇺🇸 Jack Sock (first round)

• # 🇺🇸 Michael Russell (quarterfinals, retired)

• # 🇺🇸 Donald Young (second round)

• # 🇺🇸 Ryan Harrison (second round)

• # 🇺🇸 Rajeev Ram (first round)

• # 🇺🇸 Alex Kuznetsov (quarterfinals)