| Final 19:25 |   | time | gap | L | Ag | Rct | pts | 50m |  | 1. Ian Crocker |   United States | 50.98s | WR | 3 | 20 | 0.74 | 1029 | 23.99s |  | 2. Michael Phelps |   United States | 51.10s | +0.12s | 4 | 18 | 0.74 | 1025 | 24.61s |  | 3. Andriy Serdinov |   Ukraine | 51.59s | +0.61s | 5 | 20 | 0.85 | 1012 | 24.39s |  | 4. Igor Marchenko |   Russia | 51.95s | +0.97s | 2 | 27 | 0.84 | 1002 | 24.53s |  | 5. Thomas Rupprath |   Germany | 51.98s | +1.00s | 6 | 26 | 0.74 | 1001 | 24.31s |  | 6. Takashi Yamamoto |   Japan | 52.27s | +1.29s | 8 | 25 | 0.74 | 993 | 24.53s |  | 7. Franck Esposito |   France | 52.68s | +1.70s | 7 | 32 | 0.69 | 982 | 24.70s |  | 8. Evgenii Korotyshkin |   Russia | 53.00s | +2.02s | 1 | 20 | 0.80 | 973 | 24.48s |   
| World Record: Michael Klim, Australia 51.81s Canberra, Australia 12th December 1999 |  | Championship Record: Lars Froelander, Sweden 52.10s Fukuoka, Japan 26th July 2001 |   
|
  |  | Best 8 times advanced to Final.  |   
| Semi 1 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 2. Andriy Serdinov |   Ukraine | 51.76s | WR +0.29s | 6 | 20 | 0.79 | 1007 | 2. | 24.46s |  | 3. Ian Crocker |   United States | 52.21s | +0.74s | 4 | 20 | 0.75 | 995 | 3. | 24.61s |  | 4. Thomas Rupprath |   Germany | 52.37s | +0.90s | 5 | 26 | 0.73 | 990 | 4. | 24.60s |  | 5. Igor Marchenko |   Russia | 52.44s | +0.97s | 2 | 27 | 0.82 | 988 | 5. | 24.72s |  | 7. Evgenii Korotyshkin |   Russia | 52.55s | +1.08s | 8 | 20 | 0.75 | 985 | 7. | 24.50s |  | 9. Mike Mintenko |   Canada | 52.57s | +1.10s | 3 | 27 | 0.75 | 985 | 9. | 24.50s |  | 10.Joris Keizer |   Netherlands | 52.64s | +1.17s | 1 | 24 | 0.77 | 983 | 10. | 24.40s |  | 11.Adam Pine |   Australia | 53.05s | +1.58s | 7 | 27 | 0.74 | 972 | 11. | 24.82s |   
| Semi 2 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 1. Michael Phelps |   United States | 51.47s | WR | 4 | 18 | 0.74 | 1015 | 1. | 25.11s |  | 6. Franck Esposito |   France | 52.49s | +1.02s | 5 | 32 | 0.72 | 987 | 6. | 24.67s |  | 7. Takashi Yamamoto |   Japan | 52.55s | +1.08s | 3 | 25 | 0.76 | 985 | 7. | 24.87s |  | 12.Denys Sylantyev |   Ukraine | 53.12s | +1.65s | 8 | 26 | 0.81 | 970 | 12. | 24.95s |  | 13.Geoff Huegill |   Australia | 53.13s | +1.66s | 7 | 24 | 0.74 | 970 | 13. | 24.53s |  | 14.Mattia Nalesso |   Italy | 53.16s | +1.69s | 2 | 22 | 0.75 | 969 | 14. | 24.87s |  | 15.Ioan Stefan Gherghel |   Romania | 53.18s | +1.71s | 1 | 24 | 0.85 | 968 | 15. | 25.08s |  | 16.Johannes Dietrich |   Germany | 53.76s | +2.29s | 6 | 18 | 0.79 | 952 | 16. | 24.77s |   
| Heat 15 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 1. Michael Phelps |   United States | 52.27s |   | 4 | 18 | 0.73 | 992 | 1. | 25.37s |  | 2. Ian Crocker |   United States | 52.35s | +0.08s | 5 | 20 | 0.74 | 991 | 2. | 24.40s |  | 6. Mike Mintenko |   Canada | 52.92s | +0.65s | 3 | 27 | 0.72 | 975 | 6. | 24.64s |  | 12.Adam Pine |   Australia | 53.31s | +1.04s | 2 | 27 | 0.76 | 965 | 12. | 25.18s |  | 13.Ioan Stefan Gherghel |   Romania | 53.41s | +1.14s | 8 | 24 | 0.86 | 962 | 13. | 25.24s |  | 14.Joris Keizer |   Netherlands | 53.44s | +1.17s | 6 | 24 | 0.78 | 961 | 14. | 25.08s |  | 16.Evgenii Korotyshkin |   Russia | 53.48s | +1.21s | 7 | 20 | 0.77 | 960 | 16. | 25.16s |  | 25.Luis Enrique Rojas Carpena |   Venezuela | 54.09s | +1.82s | 1 | 24 | 0.67 | 943 | 25. | 24.63s |   
| Heat 14 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 3. Franck Esposito |   France | 52.85s | +0.58s | 3 | 32 | 0.69 | 977 | 3. | 24.80s |  | 4. Thomas Rupprath |   Germany | 52.91s | +0.64s | 4 | 26 | 0.75 | 976 | 4. | 24.94s |  | 4. Takashi Yamamoto |   Japan | 52.91s | +0.64s | 6 | 25 | 0.74 | 976 | 4. | 24.97s |  | 9. Mattia Nalesso |   Italy | 53.12s | +0.85s | 8 | 22 | 0.77 | 970 | 9. | 24.93s |  | 11.Geoff Huegill |   Australia | 53.28s | +1.01s | 5 | 24 | 0.77 | 965 | 11. | 25.37s |  | 20.Zsolt Gaspar |   Hungary | 53.96s | +1.69s | 1 | 26 | 0.73 | 947 | 20. | 25.30s |  | 20.Josh Ilika Brenner |   Mexico | 53.96s | +1.69s | 7 | 26 | 0.76 | 947 | 20. | 25.01s |  | -. Ryo Takayasu |   Japan | DSQ |   | 2 | 22 | 0.79 | - | -. |   |   
| Heat 13 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 8. Andriy Serdinov |   Ukraine | 53.06s | +0.79s | 4 | 20 | 0.81 | 971 | 8. | 25.13s |  | 10.Igor Marchenko |   Russia | 53.21s | +0.94s | 5 | 27 | 0.87 | 967 | 10. | 25.15s |  | 17.Pavel Lagoun |   Belarus | 53.68s | +4.41s | 6 | 24 | 0.76 | 954 | 17. | 24.83s |  | 18.Lars Frolander |   Sweden | 53.74s | +1.47s | 3 | 29 | 0.73 | 953 | 18. | 24.97s |  | 19.Corney Swanepoel |   New Zealand | 53.95s | +1.68s | 7 | 17 | 0.74 | 947 | 19. | 24.87s |  | 28.Jere Hard |   Finland | 54.21s | +1.94s | 2 | 24 | 0.77 | 940 | 28. | 25.20s |  | 31.Rimvydas Salcius |   Lithuania | 54.64s | +2.37s | 1 | 18 | 0.77 | 926 | 31. | 25.24s |  | -. Frederick Bousquet |   France | DNS |   | 8 | 22 | - | - | -. |   |   
| Heat 12 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 7. Johannes Dietrich |   Germany | 53.01s | +0.74s | 3 | 18 | 0.77 | 973 | 7. | 24.77s |  | 15.Denys Sylantyev |   Ukraine | 53.45s | +1.18s | 5 | 26 | 0.81 | 961 | 15. | 25.11s |  | 22.Kaio Marcio Almeida |   Brazil | 53.98s | +1.71s | 7 | 18 | 0.69 | 946 | 22. | 25.63s |  | 23.Ryan Pini |   Papua New Guinea | 54.05s | +1.78s | 8 | 21 | 0.81 | 944 | 23. | 25.48s |  | 27.Theo Verster |   South Africa | 54.16s | +1.89s | 6 | 28 | 0.74 | 941 | 27. | 25.61s |  | 34.Simao Morgado |   Portugal | 54.81s | +2.54s | 4 | 24 | 0.75 | 920 | 34. | 25.44s |  | 37.Gabriel Mangabeira |   Brazil | 55.19s | +2.92s | 2 | 21 | 0.72 | 913 | 37. | 25.87s |  | -. Milorad Cavic |   Yugoslavia | DNS |   | 1 | 19 | - | - | -. |   |   
| Heat 11 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 24.Tero Valimaa |   Finland | 54.07s | +1.80s | 5 | 24 | 0.81 | 944 | 24. | 25.03s |  | 30.Camilo Becerra |   Colombia | 54.56s | +2.29s | 6 | 22 | 0.67 | 930 | 30. | 24.88s |  | 31.Ravil Nachaev |   Uzbekistan | 54.64s | +2.37s | 3 | 29 | 0.81 | 928 | 31. | 24.99s |  | 33.Georgi Palazov |   Bulgaria | 54.70s | +2.43s | 1 | 23 | 0.83 | 923 | 33. | 25.36s |  | 35.Lyndon Ferns |   South Africa | 54.94s | +2.67s | 7 | 19 | 0.75 | 915 | 35. | 25.35s |  | 37.Erik Andersson |   Sweden | 55.19s | +2.92s | 4 | 18 | 0.79 | 913 | 37. | 25.01s |  | 37.Doohee Jeong |   South Korea | 55.19s | +2.92s | 8 | 18 | 0.75 | 913 | 37. | 26.07s |   
| Heat 10 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 25.Hao Jin |   China | 54.09s | +1.82s | 1 | 24 | 0.85 | 943 | 25. | 25.25s |  | 29.Andrew Livingston |   Puerto Rico | 54.48s | +2.21s | 6 | 24 | 0.75 | 932 | 29. | 25.71s |  | 36.Romans Miloslavskis |   Latvia | 55.12s | +2.85s | 8 | 19 | 0.87 | 913 | 36. | 25.80s |  | 40.Aleksandar Miladinovski |   North Macedonia | 55.23s | +2.96s | 5 | 23 | 0.79 | 912 | 40. | 25.91s |  | 46.Philipp Gilgen |   Switzerland | 55.90s | +3.63s | 2 | 26 | 0.84 | 894 | 46. | 26.37s |  | 47.Zoran Lazarevski |   North Macedonia | 55.93s | +3.66s | 7 | 22 | 0.79 | 893 | 47. | 25.93s |  | 48.Luis Monteiro |   Portugal | 55.95s | +3.68s | 3 | 20 | 0.84 | 892 | 48. | 26.41s |  | 49.David Kolozar |   Hungary | 56.07s | +3.80s | 4 | 21 | 0.77 | 889 | 49. | 26.24s |   
| Heat 9 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 41.Petter Sjodal |   Norway | 55.27s | +3.00s | 2 | 24 | 0.82 | 911 | 41. | 25.47s |  | 42.Aghiles Slimani |   Algeria | 55.40s | +3.13s | 4 | 20 | 0.82 | 907 | 42. | 26.18s |  | 44.Rustam Khudiyev |   Kazakhstan | 55.66s | +3.39s | 3 | 18 | 0.82 | 900 | 44. | 25.85s |  | 50.Jae Hyon CHO |   South Korea | 56.30s | +4.03s | 1 |   | 0.77 | 883 | 50. | 26.67s |  | 53.Luc Decker |   Luxembourg | 56.56s | +4.29s | 5 | 26 | 0.80 | 876 | 53. | 26.57s |  | 54.Albert Subirats |   Venezuela | 56.73s | +4.46s | 6 | 16 | 0.80 | 871 | 54. | 26.30s |  | 56.Raouf Benabid |   Algeria | 56.88s | +4.61s | 8 | 17 | 0.75 | 867 | 56. | 26.81s |  | 57.Yu Lung Lubrey Lim |   Malaysia | 56.95s | +4.68s | 7 |   | 0.71 | 865 | 57. | 26.62s |   
| Heat 8 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 43.Pavel Suskov |   Lithuania | 55.64s | +3.37s | 4 | 21 | 1.00 | 901 | 43. | 26.53s |  | 51.Huazhang Zheng |   China | 56.36s | +4.09s | 8 |   | 0.79 | 881 | 51. | 26.46s |  | 52.Conrad Francis |   Sri Lanka | 56.55s | +4.28s | 6 | 21 | 0.81 | 876 | 52. | 26.32s |  | 55.Oleg Lyashko |   Uzbekistan | 56.76s | +4.49s | 5 | 20 | 0.70 | 870 | 55. | 25.87s |  | 59.Wing Cheung Victor Wong |   Macau | 57.28s | +5.01s | 3 | 18 | 0.81 | 856 | 59. | 26.70s |  | 61.William Muriel |   Ecuador | 57.52s | +5.25s | 1 |   | 0.72 | 850 | 61. | 27.14s |  | 63.Shui Ki Szeto |   Hong Kong | 57.81s | +5.54s | 2 |   | 0.77 | 842 | 63. | 26.94s |  | 72.David Cartin |   Costa Rica | 58.79s | +6.52s | 7 |   | 0.77 | 815 | 72. | 27.57s |   
| Heat 7 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 45.Nicholas Rees |   Bahamas | 55.89s | +3.62s | 4 | 21 | 0.68 | 894 | 45. | 26.53s |  | 60.Nedim Nisic |   Bosnia Herzegovina | 57.39s | +5.12s | 2 | 19 | 0.80 | 853 | 60. | 26.71s |  | 62.Ignacio Sanchez Leon |   Peru | 57.69s | +5.42s | 7 |   | 0.76 | 845 | 62. | 26.35s |  | 65.Gunther Streit |   Namibia | 57.93s | +5.66s | 8 |   | 0.71 | 838 | 65. | 26.70s |  | 66.James Walsh |   Philippines | 58.04s | +5.77s | 5 | 16 | 0.74 | 835 | 66. | 27.33s |  | 70.Miguel Navarro |   Bolivia | 58.71s | +6.44s | 7 | 21 | 0.68 | 817 | 70. | 27.66s |  | 73.Stavros Michaelides |   Cyprus | 58.80s | +6.53s | 6 | 32 | 0.75 | 815 | 73. | 26.46s |  | 81.Rafael De Leon |   Guatemala | 59.81s | +7.54s | 1 |   | 0.79 | 788 | 81. | 27.73s |   
| Heat 6 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 58.Lorenz Liechti |   Switzerland | 57.04s | +4.77s | 5 |   | 0.65 | 863 | 58. | 26.68s |  | 64.Jorge Arturo Arce |   Costa Rica | 57.87s | +5.60s | 4 | 17 | 0.79 | 840 | 64. | 27.54s |  | 68.Tuck Kar Wong |   Malaysia | 58.66s | +6.39s | 2 |   | 0.68 | 819 | 68. | 27.57s |  | 70.Sergio Cabrera |   Paraguay | 58.71s | +6.44s | 3 | 18 | 0.81 | 817 | 70. | 28.00s |  | 74.Jean Paul Adam |   Seychelles | 58.85s | +6.58s | 1 | 26 | 0.78 | 814 | 74. | 27.38s |  | 76.Gordon Touw Ngie Tjouw |   Surinam | 59.05s | +6.78s | 3 | 18 | 0.76 | 808 | 76. | 27.60s |  | 80.Zurab Khomasuridze |   Georgia | 59.56s | +7.29s | 8 | 23 | 0.78 | 795 | 80. | 27.56s |  | -. Ronald Cowen |   Bermuda | DNS |   | 6 | 22 | - | - | -. |   |   
| Heat 5 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 69.Davy Bisslik |   Aruba | 58.67s | +6.40s | 4 | 21 | 0.75 | 819 | 69. | 27.45s |  | 75.Yann Kausan |   Tahiti | 58.91s | +6.64s | 3 |   | 0.82 | 812 | 75. | 27.48s |  | 77.Roy Felipe Barahona Fuentes |   Honduras | 59.09s | +6.82s | 2 | 17 | 0.73 | 807 | 77. | 28.45s |  | 78.Ahmed Md Jewel |   Bangladesh | 59.22s | +6.95s | 5 | 20 | 0.82 | 804 | 78. | 28.15s |  | 79.Cliff Gittens |   Barbados | 59.35s | +7.08s | 7 | 20 | 0.71 | 800 | 79. | 27.39s |  | 82.Malick Fall |   Senegal | 59.90s | +7.63s | 8 | 17 | 0.83 | 786 | 82. | 27.76s |  | 93.Babak Farhoudi |   Iran | 1:01.73 | +9.46s | 1 | 17 | 0.82 | 738 | 93. | 29.24s |  | 103.Gustavo Adolfo Martinez |   Honduras | 1:05.57 | +13.30s | 6 |   | 0.72 | 645 | 103. | 29.96s |   
| Heat 4 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 67.Khaly Ciss |   Senegal | 58.62s | +6.35s | 7 |   | 0.87 | 820 | 67. | 28.14s |  | 83.Chad Miller |   Fiji | 59.93s | +7.66s | 5 |   | 0.74 | 785 | 83. | 28.47s |  | 84.Bertrand Bristol |   Seychelles | 1:00.30 | +8.03s | 8 | 21 | 0.72 | 775 | 84. | 28.28s |  | 87.Abdel Rahman Al Kaaki |   Lebanon | 1:01.08 | +8.81s | 4 | 17 | 0.81 | 755 | 87. | 28.19s |  | 90.Joao Matias |   Angola | 1:01.37 | +9.10s | 3 | 16 | 0.76 | 748 | 90. | 28.47s |  | 91.Marc Pascal Pierre Dansou |   Benin | 1:01.66 | +9.39s | 6 | 19 | 0.83 | 740 | 91. | 28.37s |  | 96.Benjamin Wells |   Papua New Guinea | 1:02.31 | +10.04s | 2 | 22 | 0.81 | 724 | 96. | 29.37s |  | -. Gregory Arkhurst |   Ivory Coast | DNS |   | 1 | 27 | - | - | -. |   |   
| Heat 3 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 88.Obaid Ahmed Obaid Saleh Aljasmi |   UA Emirates | 1:01.16 | +8.89s | 2 | 21 | 0.82 | 753 | 88. | 28.40s |  | 89.Dean Palacios |   Northern Marianas | 1:01.19 | +8.92s | 5 |   | 0.88 | 752 | 89. | 29.10s |  | 95.Yasser Omar Nunez Munguia |   Nicaragua | 1:02.15 | +9.88s | 6 | 19 | 0.83 | 728 | 95. | 29.75s |  | 97.Ammar Altamimi |   UA Emirates | 1:02.41 | +10.14s | 7 | 16 | 0.80 | 721 | 97. | 29.78s |  | 98.Ilidio Matusse |   Mozambique | 1:02.95 | +10.68s | 4 | 27 | 0.81 | 708 | 98. | 29.52s |  | 102.Zaid Saeed |   Iraq | 1:04.42 | +12.15s | 8 |   | 0.87 | 672 | 102. | 29.70s |  | -. Landry H Degnifo Enokorin |   Ivory Coast | DNS |   | 3 |   | - | - | -. |   |  | -. Yan Lin Aung |   Myanmar | DNS |   | 1 | 14 | - | - | -. |   |   
| Heat 2 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 85.Fernando Medrano |   Nicaragua | 1:00.80 | +8.53s | 4 | 15 | 0.67 | 762 | 85. | 29.05s |  | 86.Musa Bakare |   Nigeria | 1:00.87 | +8.60s | 2 | 32 | 0.89 | 761 | 86. | 28.12s |  | 94.Joao Aguiar |   Angola | 1:01.89 | +9.62s | 3 | 19 | 0.83 | 734 | 94. | 28.92s |  | 100.Kabir Singh Walia |   Kenya | 1:03.18 | +10.91s | 8 | 18 | 0.80 | 702 | 100. | 29.30s |  | 101.Rony Bakale |   Congo | 1:03.61 | +11.34s | 7 | 15 | 0.93 | 691 | 101. | 30.14s |  | 105.Daniel Kang |   Guam | 1:06.30 | +14.03s | 5 |   | 0.77 | 628 | 105. | 29.69s |  | 107.Neil Agius |   Malta | 1:07.19 | +14.92s | 1 | 17 | 0.73 | 609 | 107. | 30.61s |  | -. Sean Chow |   Fiji | DNS |   | 6 |   | - | - | -. |   |   
| Heat 1 |   | time | gap | L | Ag | Rct | pts | Rk | 50m |  | 92.Aung Kyaw MOE |   Myanmar | 1:01.67 | +9.40s | 1 |   | 0.80 | 740 | 92. | 28.67s |  | 98.Rad Aweisat |   Palestine | 1:02.95 | +10.68s | 4 | 16 | 0.81 | 708 | 98. | 28.36s |  | 104.Maximilien J Doualla Frederic |   Cameroon | 1:06.14 | +13.87s | 7 |   | 0.78 | 632 | 104. | 29.94s |  | 106.Kin-Vincent Duenas |   Guam | 1:06.46 | +14.19s | 5 | 17 | 0.75 | 625 | 106. | 29.84s |  | 108.Muzeya Muzyamba |   Zambia | 1:08.82 | +16.55s | 6 | 18 | 0.80 | 574 | 108. | 29.76s |  | 109.Chisela Kanchela |   Zambia | 1:12.62 | +20.35s | 2 | 16 | 0.83 | 501 | 109. | 32.22s |  | 110.Hassan Mubah |   Maldives | 1:14.43 | +22.16s | 8 | 19 | 0.90 | 470 | 110. | 32.11s |  | -. Clark Randrianandraina |   Madagascar | DNS |   | 3 | 15 | - | - | -. |   |   
 | 
      
 |