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2005 BA-CA-TennisTrophy
Date	10–16 October
Edition	31st
Category	International Series Gold
Draw	32S / 16D
Prize money	$664,000
Surface	Hard / indoor
Location	Vienna, Austria
Venue	Wiener Stadthalle
Champions
Singles
Ivan Ljubičić[1]
Doubles
Mark Knowles / Daniel Nestor[2]
← 2004 · Vienna Open · 2006 →

The 2005 BA-CA-TennisTrophy was a men's tennis tournament played on indoor hard courts. It was the 31st edition of the event known that year as the BA-CA-TennisTrophy, and was part of the International Series Gold of the 2005 ATP Tour. It took place at the Wiener Stadthalle in Vienna, Austria, from 10 October until 16 October 2005. Fourth-seeded Ivan Ljubičić won the singles title.

Ivan Ljubičić defeated Juan Carlos Ferrero, 6–2, 6–4, 7–6^(7–5)

• It was Ivan Ljubičić's 2nd title of the year, and his 3rd overall.

Mark Knowles / Daniel Nestor defeated Jonathan Erlich / Andy Ram, 5–3, 5–4^(7–4)

• Official website
• ATP tournament profile