Men 800 m
Heat 1
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 1 | Rashid Ramzi | BRN | 1:46.17 | Q |
| 2 | 7 | James McIlroy | GBR | 1:46.44 | Q |
| 3 | 5 | Mbulaeni Mulaudzi | RSA | 1:46.85 | Q |
| 4 | 4 | René Herms | GER | 1:47.07 | q |
| 5 | 6 | Berhanu Alemu | ETH | 1:47.37 | q |
| 6 | 3 | Osmar Barbosa dos Santos | BRA | 1:47.74 | |
| 7 | 8 | Lee Jae-hoon | KOR | 1:47.90 | |
| 8 | 8 | Tom Omey | BEL | 1:49.62 | |
| 2 | Ahmed Ismail Ismail | SUD | DNS |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 4 | Mehdi Baala | FRA | 1:46.57 | Q |
| 2 | 5 | Wilfred Bungei | KEN | 1:46.71 | Q |
| 3 | 6 | Khadevis Robinson | USA | 1:46.74 | Q |
| 4 | 2 | Dmitriy Bogdanov | RUS | 1:46.88 | q |
| 5 | 3 | Pawel Czapiewski | POL | 1:46.93 | q |
| 6 | 7 | Mohammad K Al-Azemi | KUW | 1:47.05 | q |
| 7 | 8 | Moise Joseph | HAI | 1:48.29 | |
| 8 | 1 | Geyman López | CUB | 1:52.24 | |
| 8 | Geramias da Silva | GBS | DQ |
Heat 3
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 4 | Yuriy Borzakovskiy | RUS | 1:50.14 | Q |
| 2 | 2 | William Yiampoy | KEN | 1:50.14 | Q |
| 3 | 6 | Djabir Saïd-Guerni | ALG | 1:50.16 | Q |
| 4 | 1 | Jason Stewart | NZL | 1:50.35 | |
| 5 | 3 | Dmitrijs Milkevics | LAT | 1:50.44 | |
| 6 | 5 | Fabiano Peçanha | BRA | 1:50.89 | |
| 7 | 8 | Paskar Owor | UGA | 1:51.72 | |
| 8 | 8 | Rodrigo Trinidad | PAR | 1:55.43 | |
| 7 | Samwel Mwera | TAN | DQ |
Heat 4
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 4 | Saad Kamel Youssef | BRN | 1:47.65 | Q |
| 2 | 2 | David Krummenacker | USA | 1:47.82 | Q |
| 3 | 6 | Mouhssin Chehibi | MAR | 1:48.17 | Q |
| 4 | 7 | Alfred Kirwa Yego | KEN | 1:48.72 | |
| 5 | 8 | Arnoud Okken | NED | 1:48.95 | |
| 6 | 5 | Fadrique Iglesias | BOL | 1:49.57 | |
| 7 | 1 | Onalenna Oabona | BOT | 1:50.18 | |
| 3 | Manuel Olmedo | ESP | DNF |
Heat 5
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Antonio Manuel Reina | ESP | 1:47.14 | Q |
| 2 | 1 | Gary Reed | CAN | 1:47.23 | Q |
| 3 | 4 | Amine Laalou | MAR | 1:47.62 | Q |
| 4 | 7 | André Bucher | SUI | 1:47.97 | |
| 5 | 8 | Maurizio Bobbato | ITA | 1:48.36 | |
| 6 | 3 | Juha Kukkamo | FIN | 1:48.69 | |
| 7 | 6 | Sherridan Kirk | TRI | 1:48.77 | |
| 8 | 2 | Prince Mumba | ZAM | 1:49.10 |
Heat 6
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Mansoor Ali Belal | BRN | 1:47.16 | Q |
| 2 | 4 | Sadjad Moradi | IRI | 1:47.18 | Q |
| 3 | 3 | Mohammed Al Salhi | KSA | 1:47.27 | Q |
| 4 | 2 | Eugenio Barrios | ESP | 1:47.53 | q |
| 5 | 7 | Achraf Tadili | CAN | 1:48.42 | |
| 6 | 6 | Rizak Dirshe | SWE | 1:48.43 | |
| 7 | 1 | Kevin Hicks | USA | 1:50.00 | |
| 8 | Majed Saeed Sultan | QAT | DQ |
Heat 1
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Yuriy Borzakovskiy | RUS | 1:44.26 | Q |
| 2 | 7 | Rashid Ramzi | BRN | 1:44.30 | Q |
| 3 | 4 | William Yiampoy | KEN | 1:44.51 | q |
| 4 | 2 | Djabir Saïd-Guerni | ALG | 1:44.80 | q |
| 5 | 6 | Amine Laalou | MAR | 1:45.05 | |
| 6 | 8 | Mohammad K Al-Azemi | KUW | 1:48.02 | |
| 7 | 1 | Eugenio Barrios | ESP | 1:48.76 | |
| 8 | 3 | Khadevis Robinson | USA | 1:49.13 |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Mansoor Ali Belal | BRN | 1:45.35 | Q |
| 2 | 4 | Mehdi Baala | FRA | 1:45.40 | Q |
| 3 | 6 | Mbulaeni Mulaudzi | RSA | 1:45.73 | |
| 4 | 7 | Pawel Czapiewski | POL | 1:46.33 | |
| 5 | 2 | Dmitriy Bogdanov | RUS | 1:46.83 | |
| 6 | 1 | Antonio Manuel Reina | ESP | 1:46.89 | |
| 7 | 8 | Berhanu Alemu | ETH | 1:47.66 | |
| 8 | 3 | Mohammed Al Salhi | KSA | 1:47.97 |
Heat 3
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 3 | Gary Reed | CAN | 1:44.33 | Q |
| 2 | 5 | Wilfred Bungei | KEN | 1:44.41 | Q |
| 3 | 4 | Saad Kamel Youssef | BRN | 1:44.90 | |
| 4 | 6 | Herms Ren� | GER | 1:45.21 | |
| 5 | 8 | Mouhssin Chehibi | MAR | 1:45.82 | |
| 6 | 7 | Sadjad Moradi | IRI | 1:45.88 | |
| 7 | 1 | James McIlroy | GBR | 1:45.91 | |
| 8 | 2 | David Krummenacker | USA | 1:46.76 |
| Pos | Lane | Athlete | NOC | Mark |
| 1 | 3 | Rashid Ramzi | BRN | 1:44.24 |
| 2 | 6 | Yuriy Borzakovskiy | RUS | 1:44.51 |
| 3 | 1 | William Yiampoy | KEN | 1:44.55 |
| 4 | 5 | Wilfred Bungei | KEN | 1:44.98 |
| 5 | 8 | Djabir Saïd-Guerni | ALG | 1:45.31 |
| 6 | 2 | Mehdi Baala | FRA | 1:45.32 |
| 7 | 7 | Mansoor Ali Belal | BRN | 1:45.55 |
| 8 | 4 | Gary Reed | CAN | 1:46.20 |
Women 800 m
Heat 1
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 2 | Hazel Clark | USA | 2:01.91 | Q |
| 2 | 6 | Kenia Sinclair | JAM | 2:02.18 | Q |
| 3 | 1 | Amina Aït Hammou | MAR | 2:02.36 | Q |
| 4 | 8 | Agnes Samaria | NAM | 2:02.46 | Q |
| 5 | 3 | Neisha Bernard-Thomas | GRN | 2:02.50 | |
| 6 | 4 | Brigita Langerholc | SLO | 2:03.06 | |
| 7 | 5 | Binnaz Uslu | TUR | 2:03.73 | |
| 8 | 7 | Marlyse Nsourou | GAB | 2:14.47 |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 3 | Zulia Calatayud | CUB | 2:00.77 | Q |
| 2 | 5 | Hasna Benhassi | MAR | 2:00.77 | Q |
| 3 | 2 | Kameisha Bennett | USA | 2:01.78 | Q |
| 4 | 6 | Susan Scott | GBR | 2:02.00 | Q |
| 5 | 1 | Teodora Kolarova | BUL | 2:02.45 | |
| 6 | 4 | Miho Sugimori | JPN | 2:02.82 | |
| 7 | 7 | Marcela Britos | URU | 2:10.21 | |
| 8 | 8 | Markabo Djama Liban | DJI | 2:50.95 |
Heat 3
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Tatyana Andrianova | RUS | 2:06.38 | Q |
| 2 | 6 | Alice Schmidt | USA | 2:07.10 | Q |
| 3 | 3 | Mayte Martínez | ESP | 2:07.34 | Q |
| 4 | 7 | Ewelina Setowska | POL | 2:07.37 | Q |
| 5 | 4 | Myint Myint Aye Myint Myint Aye | MYA | 2:08.50 | |
| 6 | 8 | Marian Burnett | GUY | 2:09.88 | |
| 2 | Nahida Touhami | ALG | DNS |
Heat 4
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 7 | Svetlana Cherkasova | RUS | 2:00.62 | Q |
| 2 | 4 | Laetitia Valdonado | FRA | 2:00.87 | Q |
| 3 | 1 | Svetlana Usovich | BLR | 2:01.09 | Q |
| 4 | 3 | Lucia Klocová | SVK | 2:01.63 | Q |
| 5 | 2 | Tetyana Petlyuk | UKR | 2:01.78 | q |
| 6 | 5 | Seltana Aït Hammou | MAR | 2:02.16 | |
| 7 | 8 | Elisa Cusma | ITA | 2:05.95 | |
| 8 | 6 | Gulnaz Ara | PAK | 2:13.87 |
Heat 5
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 4 | Larisa Chzhao | RUS | 2:00.64 | Q |
| 2 | 7 | Maria de Lurdes Mutola | MOZ | 2:00.71 | Q |
| 3 | 3 | Michelle Ballentine | JAM | 2:01.05 | Q |
| 4 | 6 | Mihaela Stancescu-Neacsu | ROM | 2:01.35 | Q |
| 5 | 8 | Monika Gradzki | GER | 2:01.56 | q |
| 6 | 5 | Letitia Vriesde | SUR | 2:01.65 | q |
| 7 | 1 | Diane Cummins | CAN | 2:01.71 | q |
| 2 | Akosua Serwaa | GHA | DNS |
Heat 1
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 4 | Hazel Clark | USA | 1:59.00 | Q |
| 2 | 5 | Larisa Chzhao | RUS | 1:59.07 | Q |
| 3 | 3 | Maria de Lurdes Mutola | MOZ | 1:59.29 | q |
| 4 | 6 | Mayte Martínez | ESP | 1:59.40 | q |
| 5 | 1 | Amina Aït Hammou | MAR | 2:00.22 | |
| 6 | 2 | Mihaela Stancescu-Neacsu | ROM | 2:00.63 | |
| 7 | 8 | Lucia Klocová | SVK | 2:00.64 | |
| 8 | 7 | Susan Scott | GBR | 2:01.17 |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 3 | Zulia Calatayud | CUB | 1:57.92 | Q |
| 2 | 4 | Svetlana Cherkasova | RUS | 1:58.58 | Q |
| 3 | 5 | Kenia Sinclair | JAM | 1:59.45 | |
| 4 | 1 | Diane Cummins | CAN | 2:00.10 | |
| 5 | 8 | Agnes Samaria | NAM | 2:00.13 | |
| 6 | 6 | Alice Schmidt | USA | 2:01.43 | |
| 7 | 7 | Letitia Vriesde | SUR | 2:02.07 | |
| 8 | 2 | Monika Gradzki | GER | 2:02.09 |
Heat 3
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 3 | Tatyana Andrianova | RUS | 2:01.35 | Q |
| 2 | 5 | Hasna Benhassi | MAR | 2:01.59 | Q |
| 3 | 4 | Laetitia Valdonado | FRA | 2:01.90 | |
| 4 | 1 | Ewelina Setowska | POL | 2:02.02 | |
| 5 | 6 | Svetlana Usovich | BLR | 2:02.34 | |
| 6 | 2 | Tetyana Petlyuk | UKR | 2:02.46 | |
| 7 | 8 | Michelle Ballentine | JAM | 2:03.98 | |
| 7 | Kameisha Bennett | USA | DNF |
| Pos | Lane | Athlete | NOC | Mark |
| 1 | 3 | Zulia Calatayud | CUB | 1:58.82 |
| 2 | 1 | Hasna Benhassi | MAR | 1:59.42 |
| 3 | 5 | Tatyana Andrianova | RUS | 1:59.60 |
| 4 | 2 | Maria de Lurdes Mutola | MOZ | 1:59.71 |
| 5 | 7 | Mayte Martínez | ESP | 1:59.99 |
| 6 | 6 | Larisa Chzhao | RUS | 2:00.25 |
| 7 | 4 | Svetlana Cherkasova | RUS | 2:00.71 |
| 8 | 8 | Hazel Clark | USA | 2:01.52 |
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