The World Group play-offs were the main play-offs of 2004 Davis Cup. Winners advanced to the World Group, and loser were relegated in the Zonal Regions I.

Bold indicates team has qualified for the 2005 Davis Cup World Group.

Home team	Score	Visiting team	Location	Venue	Door	Surface
Australia	4–1	Morocco	West Perth	Royal Kings Park	Outdoor	Grass
Chile	5–0	Japan	Viña del Mar	Club Naval de Campo Las Salinas	Outdoor	Clay
Croatia	3–2	Belgium	Rijeka	Dvorana Mladosti	Indoor	Carpet
Paraguay	0–5	Czech Republic	Lambaré	Yacht y Golf Club Paraguayo	Outdoor	Clay
Slovakia	3–2	Germany	Bratislava	National Tennis Centre	Indoor	Hard
Austria	3–2	Great Britain	Pörtschach	Werzer Arena Pörtschach	Outdoor	Clay
Romania	4–1	Canada	Bucharest	Clubul Sportiv Progresul Bucuresti	Outdoor	Clay
Russia	5–0	Thailand	Moscow	Olympic Stadium	Indoor	Clay

•  Australia,  Austria,  Croatia,  Czech Republic,  Romania and  Russia will remain in the World Group in 2005.
•  Chile and  Slovakia are promoted to the World Group in 2005.
•  Belgium,  Germany,  Great Britain,  Japan,  Paraguay and  Thailand will remain in Zonal Group I in 2005.
•  Canada and  Morocco are relegated to Zonal Group I in 2005.

Australia 4	Royal Kings Park, West Perth, Australia[1] 24–26 September 2004 Grass		Morocco 1
1 2 3 4 5 1 Wayne Arthurs Mounir El Aarej 78 66 6 4 6 3       2 Lleyton Hewitt Mehdi Tahiri 6 0 6 2 6 2       3 Wayne Arthurs / Todd Woodbridge Mounir El Aarej / Mehdi Tahiri 710 68 77 62 6 3       4 Todd Reid Mounir El Aarej 2 6 3 6         5 Todd Woodbridge Mehdi Ziadi 6 0 6 2

Chile 5	Club Naval de Campo Las Salinas, Viña del Mar, Chile[2] 24–26 September 2004 Clay		Japan 0
1 2 3 4 5 1 Nicolás Massú Gouichi Motomura 6 1 6 1 6 1       2 Fernando González Takao Suzuki 6 4 6 2 77 61       3 Fernando González / Nicolás Massú Thomas Shimada / Takao Suzuki 6 3 6 3 6 1       4 Hermes Gamonal Takao Suzuki 7 5 2 6 6 2       5 Fernando González Gouichi Motomura 6 3 6 3

Croatia 3	Dvorana Mladosti, Rijeka, Croatia[3] 24–26 September 2004 Carpet (i)		Belgium 2
1 2 3 4 5 1 Ivan Ljubičić Gilles Elseneer 78 66 7 5 6 4       2 Mario Ančić Olivier Rochus 6 3 77 62 6 1       3 Mario Ančić / Ivan Ljubičić Dick Norman / Kristof Vliegen 68 710 6 4 61 77 6 3 7 5   4 Saša Tuksar Olivier Rochus 6 4 3 6 3 6       5 Mario Ančić Gilles Elseneer 64 77 1 2       retired

Paraguay 0	Yacht y Golf Club Paraguayo, Lambaré, Paraguay[4] 24–26 September 2004 Clay		Czech Republic 5
1 2 3 4 5 1 Paulo Carvallo Jiří Novák 6 3 4 6 5 7 3 6     2 Ramón Delgado Tomáš Berdych 6 3 6 4 3 6 2 6 4 6   3 Paulo Carvallo / Ramón Delgado Jiří Novák / Radek Štěpánek 2 6 5 7 3 6       4 Ramón Delgado Radek Štěpánek 4 6 2 6         5 Francisco Rodríguez Michal Tabara 3 6 1 6

Slovakia 3	National Tennis Centre, Bratislava, Slovakia[5] 24–26 September 2004 Hard (i)		Germany 2
1 2 3 4 5 1 Dominik Hrbatý Florian Mayer 6 3 6 1 6 3       2 Karol Beck Tommy Haas 77 62 1 6 1 6 1 6     3 Dominik Hrbatý / Karol Kučera Tommy Haas / Alexander Waske 3 6 3 6 6 3 6 4 3 6   4 Dominik Hrbatý Tommy Haas 6 3 6 3 7 5       5 Karol Kučera Florian Mayer 6 4 6 0 6 2

Austria 3	Werzer Arena Pörtschach, Pörtschach, Austria[6] 24-26 September 2004 Clay		Great Britain 2
1 2 3 4 5 1 Stefan Koubek Tim Henman 6 3 6 3 6 1       2 Jürgen Melzer Greg Rusedski 6 3 3 6 4 6 64 77     3 Julian Knowle / Alexander Peya Tim Henman / Greg Rusedski 6 4 1 6 6 2 6 1     4 Jürgen Melzer Tim Henman 6 0 2 6 64 77 2 6     5 Stefan Koubek Greg Rusedski 77 62 6 4 7 5

Romania 4	Clubul Sportiv Progresul Bucuresti, Bucharest, Romania[7] 24–26 September 2004 Clay		Canada 1
1 2 3 4 5 1 Andrei Pavel Simon Larose 7 5 6 3 6 2       2 Victor Hănescu Frank Dancevic 5 7 6 3 3 6 6 3 6 4   3 Victor Ioniță / Florin Mergea Daniel Nestor / Frédéric Niemeyer 4 6 4 6 6 2 2 6     4 Andrei Pavel Frank Dancevic 6 2 6 4 6 2       5 Victor Ioniță Simon Larose 4 2           retired

Russia 5	Olympic Stadium, Moscow, Russia[8] 24–26 September 2004 Clay (i)		Thailand 0
1 2 3 4 5 1 Igor Andreev Paradorn Srichaphan 7 5 6 2 6 4       2 Marat Safin Danai Udomchoke 6 4 6 1 6 2       3 Marat Safin / Mikhail Youzhny Sanchai Ratiwatana / Sonchat Ratiwatana 6 2 6 1 6 4       4 Nikolay Davydenko Sonchat Ratiwatana 6 2 6 0         5 Mikhail Youzhny Sanchai Ratiwatana 6 4 6 2