Men 800 m
Heat 1
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 6 | Wilson Kipketer | DEN | 1:47.29 | Q |
| 2 | 3 | Savieri Ngidhi | ZIM | 1:47.58 | Q |
| 3 | 5 | Vebjørn Rodal | NOR | 1:48.05 | |
| 4 | 4 | Assane Diallo | SEN | 1:48.06 | |
| 5 | 2 | Khadevis Robinson | USA | 1:48.31 | |
| 6 | 7 | José Manuel Cerezo | ESP | 1:50.08 | |
| 8 | Milton Browne | BAR | DQ |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 6 | André Bucher | SUI | 1:46.81 | Q |
| 2 | 2 | Wojciech Kaldowski | POL | 1:46.88 | Q |
| 3 | 1 | Arthémon Hatungimana | BUR | 1:47.08 | |
| 4 | 5 | Mark Sesay | GBR | 1:47.48 | |
| 5 | 3 | Mouhssin Chehibi | MAR | 1:47.65 | |
| 6 | 8 | Frederick Onyancha | KEN | 1:47.76 | |
| 7 | 4 | Naseer Ismail | MLD | 1:56.67 | |
| 7 | Karma Dorji | BHU | DQ |
Heat 3
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 3 | Andrea Longo | ITA | 1:45.01 | Q |
| 2 | 4 | Grant Cremer | AUS | 1:45.21 | Q |
| 3 | 6 | Adem Hecini | ALG | 1:46.13 | q |
| 4 | 2 | James Nolan | IRL | 1:46.38 | q |
| 5 | 5 | Soon-Hyung Kim | KOR | 1:46.78 | q |
| 6 | 8 | Guillaume Douceret | FRA | 1:47.69 | |
| 7 | 7 | Mohamed Abd El Rahman | SUD | 1:53.67 |
Heat 4
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 8 | Rich Kenah | USA | 1:47.95 | Q |
| 2 | 1 | Kennedy Kimwetich | KEN | 1:48.45 | Q |
| 3 | 5 | Khaled Azerkan | SWE | 1:48.46 | |
| 4 | 4 | Crispen Mutakanyi | ZIM | 1:48.73 | |
| 5 | 6 | Aleksander Trutko | BLR | 1:48.99 | |
| 6 | 2 | Curtis Robb | GBR | 1:49.13 | |
| 7 | 3 | Batmunkh Banzragch | MGL | 2:02.42 | |
| 7 | Lucky Hadebe | RSA | DQ |
Heat 5
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 8 | Djabir Saïd-Guerni | ALG | 1:45.65 | Q |
| 2 | 7 | Hezekiél Sepeng | RSA | 1:46.01 | Q |
| 3 | 2 | Nico Motchebon | GER | 1:46.18 | q |
| 4 | 6 | Rachid Khouia | MAR | 1:46.96 | |
| 5 | 4 | Ian Roberts | GUY | 1:47.53 | |
| 6 | 5 | Urmet Uusorg | EST | 1:48.85 | |
| 7 | 3 | Mohammed Al Fayet | PAL | 1:52.53 |
Heat 6
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 7 | Johan Botha | RSA | 1:46.59 | Q |
| 2 | 4 | Jean-Patrick Nduwimana | BUR | 1:46.73 | Q |
| 3 | 2 | Nils Schumann | GER | 1:46.79 | q |
| 4 | 3 | João Pires | POR | 1:47.08 | |
| 5 | 6 | Jason Lobo | GBR | 1:47.53 | |
| 6 | 8 | Balázs Korányi | HUN | 1:47.60 | |
| 7 | 5 | Carlos Calvo | LUX | 1:48.48 |
Heat 7
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 7 | Japheth Kimutai | KEN | 1:45.66 | Q |
| 2 | 3 | Roman Oravec | CZE | 1:45.80 | Q |
| 3 | 8 | Bryan Woodward | USA | 1:45.98 | q |
| 4 | 2 | Glody Dube | BOT | 1:46.67 | q |
| 5 | 6 | Zach Whitmarsh | CAN | 1:47.01 | |
| 6 | 5 | Tor Oivind Ødegard | NOR | 1:47.07 | |
| 7 | 4 | Víctor Martínez | AND | 1:48.73 |
Heat 8
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 1 | Wilson Kirwa | FIN | 1:46.20 | Q |
| 2 | 8 | Roberto Parra | ESP | 1:46.22 | Q |
| 3 | 4 | Norberto Téllez | CUB | 1:46.24 | q |
| 4 | 2 | Mahjoub Haïda | MAR | 1:46.86 | |
| 5 | 5 | Panagiotis Stroubakos | GRE | 1:48.56 | |
| 6 | 3 | David Matthews | IRL | 1:49.52 | |
| 7 | 7 | Ketson Kabiriel | NMA | 2:07.73 | |
| 6 | Abdul Rahman Hasan Abdulla | QAT | DNS |
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 3 | Hezekiél Sepeng | RSA | 1:45.20 | Q |
| 2 | 4 | Andrea Longo | ITA | 1:45.63 | Q |
| 3 | 6 | Rich Kenah | USA | 1:45.99 | |
| 4 | 5 | Roberto Parra | ESP | 1:46.07 | |
| 5 | 1 | Wojciech Kaldowski | POL | 1:46.49 | |
| 6 | 8 | Adem Hecini | ALG | 1:46.61 | |
| 7 | 7 | James Nolan | IRL | 1:47.07 | |
| 8 | 2 | Soon-Hyung Kim | KOR | 1:47.15 |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Wilson Kipketer | DEN | 1:44.87 | Q |
| 2 | 3 | Djabir Saïd-Guerni | ALG | 1:45.17 | Q |
| 3 | 1 | Norberto Téllez | CUB | 1:45.22 | q |
| 4 | 2 | Kennedy Kimwetich | KEN | 1:45.67 | q |
| 5 | 6 | Roman Oravec | CZE | 1:45.78 | |
| 6 | 7 | Savieri Ngidhi | ZIM | 1:46.56 | |
| 7 | 4 | Wilson Kirwa | FIN | 1:46.65 | |
| 8 | 8 | Nico Motchebon | GER | 1:47.17 |
Heat 3
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Japheth Kimutai | KEN | 1:47.74 | Q |
| 2 | 2 | Nils Schumann | GER | 1:47.90 | Q |
| 3 | 4 | André Bucher | SUI | 1:48.07 | |
| 4 | 3 | Grant Cremer | AUS | 1:48.22 | |
| 5 | 1 | Glody Dube | BOT | 1:48.67 | |
| 6 | 7 | Jean-Patrick Nduwimana | BUR | 1:48.91 | |
| 7 | 6 | Johan Botha | RSA | 1:49.71 | |
| 8 | 8 | Bryan Woodward | USA | 1:55.52 |
| Pos | Lane | Athlete | NOC | Mark |
| 1 | 5 | Wilson Kipketer | DEN | 1:43.30 |
| 2 | 4 | Hezekiél Sepeng | RSA | 1:43.32 |
| 3 | 3 | Djabir Saïd-Guerni | ALG | 1:44.18 |
| 4 | 1 | Norberto Téllez | CUB | 1:45.03 |
| 5 | 6 | Japheth Kimutai | KEN | 1:45.18 |
| 6 | 2 | Andrea Longo | ITA | 1:45.33 |
| 7 | 8 | Kennedy Kimwetich | KEN | 1:46.27 |
| 8 | 7 | Nils Schumann | GER | 1:46.79 |
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 4 | Jearl Miles-Clark | USA | 2:00.32 | Q |
| 2 | 6 | Claudia Gesell | GER | 2:00.32 | Q |
| 3 | 5 | Letitia Vriesde | SUR | 2:00.46 | q |
| 4 | 2 | Diane Modahl | GBR | 2:00.83 | |
| 5 | 3 | Judit Varga | HUN | 2:01.72 | |
| 6 | 8 | Toni Hodgkinson | NZL | 2:02.18 | |
| 7 | 7 | Tytti Reho | FIN | 2:03.72 |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Stephanie Graf | AUT | 2:00.16 | Q |
| 2 | 7 | Natalya Tsyganova | RUS | 2:00.32 | Q |
| 3 | 2 | Meredith Rainey-Valmon | USA | 2:00.86 | |
| 4 | 4 | Patrizia Spuri | ITA | 2:01.00 | |
| 5 | 6 | Irina Nedelenko-Lishchinskaya | UKR | 2:01.53 | |
| 6 | 1 | Tamsyn Lewis | AUS | 2:03.03 | |
| 7 | 3 | Leontine Tsiba | CGO | 2:04.19 | |
| 8 | 8 | Alberta Cape | GBS | 2:19.79 |
Heat 3
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 2 | Sandra Stals | BEL | 2:00.07 | Q |
| 2 | 5 | Maria Lurdes Mutola | MOZ | 2:00.10 | Q |
| 3 | 6 | Natalya Gorelova | RUS | 2:00.13 | q |
| 4 | 8 | Natalya Dukhnova | BLR | 2:00.42 | q |
| 5 | 3 | Grace Birungi | UGA | 2:02.71 | |
| 6 | 4 | Julia Sakara | ZIM | 2:03.52 | |
| 7 | Kutre Dulecha | ETH | DNS |
Heat 4
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 4 | Ludmila Formanová | CZE | 1:59.52 | Q |
| 2 | 2 | Kelly Holmes | GBR | 1:59.72 | Q |
| 3 | 1 | Lwiza Msyani John | TAN | 2:00.49 | q |
| 4 | 8 | Brigita Langerholc | SLO | 2:00.50 | q |
| 5 | 3 | Zulia Calatayud | CUB | 2:00.93 | |
| 6 | 6 | Heidi Jensen | DEN | 2:01.12 | |
| 7 | 5 | Vicky Lynch-Pounds | CAN | 2:02.66 | |
| 8 | 7 | Addeh Mwamba | ZAM | 2:07.96 |
Heat 5
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Svetlana Masterkova | RUS | 2:00.27 | Q |
| 2 | 2 | Yelena Martson-Buzhenko | UKR | 2:00.33 | Q |
| 3 | 8 | Linda Kisabaka | GER | 2:00.46 | q |
| 4 | 6 | Anita Brägger | SUI | 2:01.89 | |
| 5 | 7 | Adoración García | ESP | 2:04.68 | |
| 6 | 3 | Charmaine Howell | JAM | 2:04.73 | |
| 7 | 4 | Tsvetelina Kirilova | BUL | 2:07.41 |
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 6 | Maria Lurdes Mutola | MOZ | 1:59.84 | Q |
| 2 | 3 | Jearl Miles-Clark | USA | 2:00.37 | Q |
| 3 | 8 | Natalya Tsyganova | RUS | 2:00.67 | Q |
| 4 | 5 | Kelly Holmes | GBR | 2:00.77 | |
| 5 | 2 | Linda Kisabaka | GER | 2:00.81 | |
| 6 | 1 | Lwiza Msyani John | TAN | 2:01.92 | |
| 7 | 7 | Yelena Martson-Buzhenko | UKR | 2:02.01 | |
| 8 | 4 | Sandra Stals | BEL | 2:09.22 |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 3 | Svetlana Masterkova | RUS | 1:59.25 | Q |
| 2 | 6 | Ludmila Formanová | CZE | 1:59.42 | Q |
| 3 | 5 | Stephanie Graf | AUT | 1:59.61 | Q |
| 4 | 1 | Natalya Dukhnova | BLR | 2:00.03 | q |
| 5 | 8 | Natalya Gorelova | RUS | 2:00.14 | q |
| 6 | 7 | Letitia Vriesde | SUR | 2:00.33 | |
| 7 | 4 | Claudia Gesell | GER | 2:01.24 | |
| 8 | 2 | Brigita Langerholc | SLO | 2:04.51 |
| Pos | Lane | Athlete | NOC | Mark |
| 1 | 6 | Ludmila Formanová | CZE | 1:56.68 |
| 2 | 3 | Maria Lurdes Mutola | MOZ | 1:56.72 |
| 3 | 5 | Svetlana Masterkova | RUS | 1:56.93 |
| 4 | 4 | Jearl Miles-Clark | USA | 1:57.40 |
| 5 | 7 | Natalya Tsyganova | RUS | 1:57.81 |
| 6 | 2 | Natalya Gorelova | RUS | 1:57.90 |
| 7 | 8 | Stephanie Graf | AUT | 1:57.92 |
| 8 | 1 | Natalya Dukhnova | BLR | 1:58.69 |
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