2015 Delray Beach International Tennis Championships – Singles

Marin Čilić was the defending champion, but withdrew due to injury.

Ivo Karlović won the title, defeating Donald Young in the final, 6–3, 6–3.

Seeds
Kevin Anderson (second round) 🇺🇸 John Isner (first round) 🇺🇦 Alexandr Dolgopolov (quarterfinals) Ivo Karlović (champion) 🇫🇷 Adrian Mannarino (semifinals) 🇺🇸 Sam Querrey (first round, retired) 🇺🇸 Steve Johnson (quarterfinals) 🇷🇸 Viktor Troicki (second round)

Seeds
Aljaž Bedene (second round) 🇷🇴 Victor Hănescu (qualifying competition) 🇦🇺 Thanasi Kokkinakis (qualified) 🇯🇵 Yoshihito Nishioka (qualified) 🇺🇸 Ryan Harrison (withdrew) 🇺🇸 Chase Buchanan (second round) 🇺🇸 Alex Kuznetsov (qualifying competition) 🇺🇸 Jared Donaldson (first round)

Qualifiers
• # 🇦🇺 John-Patrick Smith

• # 🇺🇸 Eric Quigley

• # 🇦🇺 Thanasi Kokkinakis

• # 🇯🇵 Yoshihito Nishioka