| Doubles | |
|---|---|
| 2005 ATP Buenos Aires | |
| Champions |  František Čermák Leoš Friedl |
| Runners-up |  José Acasuso Sebastián Prieto |
| Final score | 6–2, 7–5 |
Lucas Arnold and Mariano Hood were the defending champions, but lost in the semifinals this year.
František Čermák and Leoš Friedl won the title, defeating José Acasuso and Sebastián Prieto 6–2, 7–5 in the final.
Gastón Etlis / Martín Rodríguez (first round) Lucas Arnold / Mariano Hood (semifinals) František Čermák / Leoš Friedl (champions)
Mariusz Fyrstenberg / Marcin Matkowski (quarterfinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | G Etlis M Rodríguez | 6 | 2 | 3 | |||||||||||||||||||||||
| WC | JP Brzezicki C Villagrán | 2 | 6 | 6 | WC | JP Brzezicki C Villagrán | 77 | 2 | 6 | ||||||||||||||||||
 E Artoni I González King | 6 | 5 | 6 | E Artoni I González King | 63 | 6 | 3 | ||||||||||||||||||||
| G Galimberti F Volandri | 2 | 7 | 2 | WC | JP Brzezicki C Villagrán | 68 | 4 | ||||||||||||||||||||
| 4 | M Fyrstenberg M Matkowski | 7 | 6 | J Acasuso S Prieto | 710 | 6 | |||||||||||||||||||||
| JI Chela J Mónaco | 5 | 4 | 4 | M Fyrstenberg M Matkowski | 2 | 3 | |||||||||||||||||||||
| J Acasuso S Prieto | 6 | 6 | J Acasuso S Prieto | 6 | 6 | ||||||||||||||||||||||
 Ó Hernández P Starace | 0 | 1 | J Acasuso S Prieto | 2 | 5 | ||||||||||||||||||||||
| A Martín R Nadal | 2 | 6 | 6 | 3 | F Čermák L Friedl | 6 | 7 | ||||||||||||||||||||
| WC | À Corretja J-P Guzmán | 6 | 3 | 4 | A Martín R Nadal | 6 | 3 | 0 | |||||||||||||||||||
| Alt | Á Calatrava D Sánchez | 65 | 1 | 3 | F Čermák L Friedl | 3 | 6 | 6 | |||||||||||||||||||
| 3 | F Čermák L Friedl | 77 | 6 | 3 | F Čermák L Friedl | 6 | 61 | 6 | |||||||||||||||||||
| G Cañas M García | 6 | 7 | 2 | L Arnold M Hood | 1 | 77 | 1 | ||||||||||||||||||||
 K Braasch T Cibulec | 3 | 5 | G Cañas M García | 0 | 2 | ||||||||||||||||||||||
O Fukárek  R Wassen | 6 | 1 | 2 | 2 | L Arnold M Hood | 6 | 6 | ||||||||||||||||||||
| 2 | L Arnold M Hood | 3 | 6 | 6 | |||||||||||||||||||||||
Jonas Björkman and Todd Woodbridge were the defending champions, but lost in the third round to Leander Paes and David Rikl.
Bob and Mike Bryan were the defending champions, they lost to sixth-seeded Michaël Llodra and Fabrice Santoro in the semifinals.
Mariusz Fyrstenberg and Marcin Matkowski were the defending champions, but lost in the semifinals to František Čermák and Leoš Friedl.
Michaël Llodra and Fabrice Santoro were the defending champions, and won the final 7–6(4), 6–3 against Bob and Mike Bryan.
Tomás Carbonell and Daniel Orsanic were the defending champions but did not compete that year.
Gastón Etlis and Martín Rodríguez were the defending champions but lost in the first round to Agustín Calleri and Mariano Hood.
Gastón Etlis and Martín Rodríguez were the defending champions but lost in the first round to David Ferrer and Fernando Vicente.
Mahesh Bhupathi and Leander Paes were the defending champions but did not compete that year.
František Čermák and Leoš Friedl were the defending champions but lost in the final 6–4, 6–7 (7–9), 6–3 against Mariusz Fyrstenberg and Marcin Matkowski.
Lucas Arnold and Luis Lobo were the defending champions but only Arnold competed that year with Mariano Hood.
Agustín Calleri and Mariano Hood were the defending champions but only Hood competed that year with Lucas Arnold.
Mariano Hood and Sebastián Prieto were the defending champions but they competed with different partners that year, Hood with Lucas Arnold and Prieto with Martín García.
In the finale of the 2006 Estoril Open's Men's Doubles, František Čermák and Leoš Friedl were defending champions from the previous year. Čermák did not participate. Lukáš Dlouhý and Pavel Vízner won in the final 6–3, 6–1, against Lucas Arnold and Leoš Friedl.
Enzo Artoni and Fernando Vicente were the defending champions. Artoni partnered with Marcin Matkowski this year, losing in the quarterfinals. Vicente did not participate.
Juan Ignacio Chela and Gastón Gaudio were the defending champions, but did not participate this year.
Mahesh Bhupathi and Max Mirnyi were the defending champions, but lost in the quarterfinals to Michaël Llodra and Fabrice Santoro.
Mariusz Fyrstenberg and Marcin Matkowski were the defending champions, but declined to participate to focus for the 2004 Summer Olympics.
Bob Bryan and Mike Bryan were the defending champions but did not compete that year.
Martin Damm and Cyril Suk were the defending champions, but lost in the semifinals to Lucas Arnold Ker and Martín García.
Lucas Arnold Ker and Mariano Hood successfully defended their title by defeating Gastón Etlis and Martín Rodríguez 7–5, 6–2 in the final. Arnold Ker won the tournament for the third year in a row.