2005 ABN AMRO World Tennis Tournament – Singles

Lleyton Hewitt was the defending champion, but chose not to participate that year.

Roger Federer won in the final 5–7, 7–5, 7–6(7–5), against Ivan Ljubičić.

Seeds

 * 1)  Roger Federer (champion)
 * 2) 🇦🇷 Guillermo Coria (second round)
 * 3) 🇬🇧 Tim Henman (quarterfinals)
 * 4) 🇦🇷 David Nalbandian (first round)
 * 5) 🇸🇪 Joachim Johansson (second round)
 * 6) 🇷🇺 Nikolay Davydenko (quarterfinals)
 * 7) 🇸🇰 Dominik Hrbatý (first round)
 * 8) 🇪🇸 Feliciano López (first round)