2006 Croatia Open Umag – Singles

Stan Wawrinka won his first ATP title, after Novak Djokovic retired in the final while leading 3–1 in the first-set tiebreak.

Guillermo Coria was the defending champion, but lost in the first round to Robin Vik.

Seeds
• # 🇪🇸 David Ferrer (withdrew)

• # 🇪🇸 Juan Carlos Ferrero (first round)

• # 🇦🇷 Guillermo Coria (first round)

• # 🇷🇸 Novak Djokovic (final, retired due to breathing problems)

• # 🇪🇸 Carlos Moyá (semifinals)

• # 🇪🇸 Alberto Martín (first round)

• # 🇫🇷 Julien Benneteau (first round)

• # 🇮🇹 Filippo Volandri (semifinals)