The 2005 Brasil Open was an ATP men's tennis tournament held in Mata de São João, Brazil. It was the fifth edition of the tournament and was held from February 14 to February 21. Rafael Nadal won the singles title.[1] [2] [3]
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Argentina | Withdrew[4] | |||
| Fernando González | 17 | 2 | ||
| Argentina | Juan Ignacio Chela | 23 | 3 | |
 Italy | Filippo Volandri | 41 | 4 | |
 Spain | David Ferrer | 47 | 5 | |
| Spain | Rafael Nadal | 48 | 6 | |
| Argentina | Mariano Zabaleta | 51 | 7 | |
| Spain | Albert Costa | 54 | 8 | |
 Brazil | Ricardo Mello | 56 | 9 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
The following player received entry as a special exemption:
Gastón Gaudio (Pubalgia) David Ferrer (Flu) Óscar Hernández (Right ankle sprain) Filippo Volandri (Flu) Martín Vassallo Argüello (Heat stress)The following pairs received wildcards into the main draw:
Marcos Daniel / Franco Ferreiro Henrique Mello / Ricardo Mello Alberto Martín (lower back pain)See main article: 2005 Brasil Open – Singles. Rafael Nadal defeated Alberto Martín 6–0, 6–7(2–7), 6–1
See main article: 2005 Brasil Open – Doubles. 
František Čermák / Leoš Friedl defeated José Acasuso / Ignacio González King 6–4, 6–4
