The 2005 SAP Open was a men's tennis tournament played on indoor hard courts. It was the 116th edition of the event and was part of the International Series of the 2005 ATP Tour. It took place at the HP Pavilion in San Jose, United States, from February 7 through February 13, 2005. First-seeded Andy Roddick won the singles title.
Andy Roddick def. Cyril Saulnier, 6–0, 6–4
- It was Andy Roddick's 1st title of the year, and his 16th overall. It was his 2nd win at the event.
Wayne Arthurs / Paul Hanley def. Yves Allegro / Michael Kohlmann, 7–6(7–4), 6–4