| Swimmer | Q. time | Birth | L | Heat | 
| -. Florent Manaudou |  FRA | 21.32s | 1990 | 4 | Heat 12 | 
| -. Anthony Ervin |  USA | 21.55s | 1981 | 4 | Heat 11 | 
| -. Marco Orsi |  ITA | 21.64s | 1990 | 4 | Heat 10 | 
| -. Vladimir Morozov |  RUS | 21.65s | 1992 | 5 | Heat 12 | 
| -. Bruno Fratus |  BRA | 21.74s | 1989 | 5 | Heat 11 | 
| -. Benjamin Proud |  GBR | 21.76s | 1994 | 5 | Heat 10 | 
| -. Cesar Cielo Filho |  BRA | 21.84s | 1987 | 3 | Heat 12 | 
| -. Matthew Abood |  AUS | 21.87s | 1986 | 3 | Heat 11 | 
| -. Krisztian Takacs |  HUN | 21.89s | 1985 | 3 | Heat 10 | 
| -. Katsumi Nakamura |  JPN | 21.90s | 1994 | 6 | Heat 12 | 
| -. Ari-Pekka Liukkonen |  FIN | 21.93s | 1989 | 6 | Heat 11 | 
| -. Zetao Ning |  CHN | 21.95s | 1993 | 6 | Heat 10 | 
| -. Kristian Gkolomeev |  GRE | 21.96s | 1993 | 2 | Heat 12 | 
| -. Nathan Adrian |  USA | 21.97s | 1988 | 2 | Heat 11 | 
| -. Hexin Yu |  CHN | 22.00s | 1996 | 2 | Heat 10 | 
| -. Andrey Grechin |  RUS | 22.01s | 1987 | 7 | Heat 12 | 
| -. Andrii Govorov |  UKR | 22.02s | 1992 | 7 | Heat 11 | 
| -. Shinri Shioura |  JPN | 22.04s | 1991 | 7 | Heat 10 | 
| -. Clement Mignon |  FRA | 22.08s | 1993 | 1 | Heat 12 | 
| -. Luca Dotto |  ITA | 22.12s | 1990 | 1 | Heat 11 | 
| -. Francois Heersbrandt |  BEL | 22.17s | 1989 | 1 | Heat 10 | 
| -. Odyssefs Meladinis |  GRE | 22.18s | 1990 | 8 | Heat 12 | 
| -. Jasper Aerents |  BEL | 22.19s | 1992 | 8 | Heat 11 | 
| -. Karl Krug IV |  CAN | 22.21s | 1989 | 8 | Heat 10 | 
| -. Alejandro Escudero |  MEX | 22.24s | 1990 | 0 | Heat 12 | 
|  Standard A: 22.25s | 
| -. Renzo Tjon-A-Joe |  SUR | 22.30s | 1995 | 0 | Heat 11 | 
| -. Simonas Bilis |  LTU | 22.31s | 1993 | 0 | Heat 10 | 
| -. Marius Radu |  ROU | 22.44s | 1992 | 9 | Heat 12 | 
| -. Dylan Carter |  TRI | 22.49s | 1996 | 9 | Heat 11 | 
| -. Miguel Ortiz-Canavate |  ESP | 22.52s | 1991 | 9 | Heat 10 | 
| -. Pjotr Degtjarjov |  EST | 22.59s | 1993 | 4 | Heat 9 | 
| -. Geoffrey Robin Cheah |  HKG | 22.61s | 1990 | 5 | Heat 9 | 
| -. Boris Stojanovic |  SRB | 22.70s | 1989 | 3 | Heat 9 | 
| -. Christoffer Carlsen |  SWE | 22.71s | 1992 | 6 | Heat 9 | 
| -. Demir Atasoy |  TUR | 22.74s | 1987 | 2 | Heat 9 | 
| -. Ali Ahmed Mahmoud Ali Khalafalla |  EGY | 22.75s | 1996 | 7 | Heat 9 | 
| -. Mario Todorovic |  CRO | 22.76s | 1988 | 8 | Heat 9 | 
| -. Cristian Quintero |  VEN | 22.76s | 1992 | 1 | Heat 9 | 
| -. Anton Latkin |  BLR | 22.81s | 1994 | 0 | Heat 9 | 
| -. Luis Armando Flores Bellina |  PUR | 22.84s | 1994 | 9 | Heat 9 | 
| -. Gabriel Melconian |  URU | 22.87s | 1987 | 4 | Heat 8 | 
| -. Sidni Hoxha |  ALB | 22.89s | 1992 | 5 | Heat 8 | 
| -. Mohammed Madouh |  KUW | 23.00s | 1987 | 6 | Heat 8 | 
| -. Virdhawal Vikram Khade |  IND | 23.00s | 1991 | 3 | Heat 8 | 
| -. Julien Henx |  LUX | 23.03s | 1995 | 2 | Heat 8 | 
|  Standard B: 23.03s  | 
| -. Jordan Augier |  LCA | 23.08s | 1994 | 7 | Heat 8 | 
| -. Oliver Elliot |  CHI | 23.10s | 1987 | 1 | Heat 8 | 
| -. Andrew Chetcuti |  MLT | 23.17s | 1992 | 8 | Heat 8 | 
| -. Elvis Burrows |  BAH | 23.24s | 1989 | 0 | Heat 8 | 
| -. Meli Malani |  FIJ | 23.32s | 1996 | 9 | Heat 8 | 
| -. Stanislav Karnaukhov |  KGZ | 23.47s | 1996 | 4 | Heat 7 | 
| -. Maksim Inic |  MNE | 23.49s | 1996 | 5 | Heat 7 | 
| -. Anthony John Barbar |  LIB | 23.51s | 1992 | 3 | Heat 7 | 
| -. Sam Seghers |  PNG | 23.55s | 1994 | 6 | Heat 7 | 
| -. Vahan Mkhitaryan |  ARM | 23.58s | 1996 | 2 | Heat 7 | 
| -. Allan Gutierrez |  HON | 23.63s | 1993 | 7 | Heat 7 | 
| -. Lorenzo Loria |  MEX | 23.63s | 1995 | 1 | Heat 7 | 
| -. Mikel Schreuders |  ARU | 23.63s | 1998 | 8 | Heat 7 | 
| -. Thibaut Danho |  CIV | 23.70s | 1994 | 4 | Heat 6 | 
| -. Miguel Mena |  NCA | 23.71s | 1997 | 0 | Heat 7 | 
| -. Jagger Stephens |  GUM | 23.75s | 1998 | 9 | Heat 7 | 
| -. Issa Abdulla Hemed Mohamed |  KEN | 23.79s | 1995 | 5 | Heat 6 | 
| -. Frantz Mike Itelord Dorsainvil |  HAI | 23.83s | 1991 | 3 | Heat 6 | 
| -. Jhonny Perez |  DOM | 23.89s | 1997 | 6 | Heat 6 | 
| -. K M Abdoul Niane |  SEN | 23.90s | 1988 | 2 | Heat 6 | 
| -. Sidrell Nicholas Williams |  JAM | 24.03s | 1996 | 7 | Heat 6 | 
| -. CheranthaDe Silva K T |  Fin | 24.19s | 1996 | 1 | Heat 6 | 
| -. Samson Samuel Opuakpo Forcados |  NGR | 24.21s | 1986 | 8 | Heat 6 | 
| -. Athoumane Soule Soilihi |  COM | 24.25s | 1991 | 0 | Heat 6 | 
| -. Jose Quintanilla |  BOL | 24.26s | 1997 | 9 | Heat 6 | 
| -. Joao Aguiar |  ANG | 24.42s | 1983 | 4 | Heat 5 | 
| -. Saleh Faraj Sultan Fahran |  BRN | 24.46s | 1996 | 5 | Heat 5 | 
| -. Ahmad Mohamed Attellesey |  LBA | 24.56s | 1995 | 3 | Heat 5 | 
| -. Denilson Cardoso Da Costa |  MOZ | 24.73s | 1998 | 6 | Heat 5 | 
| -. Mohammad Zeyad J Abdo |  PLE | 24.80s | 1993 | 2 | Heat 5 | 
| -. Christian Nikles |  BRU | 24.81s | 1997 | 7 | Heat 5 | 
| -. Alex Sobers |  BAR | 24.84s | 1998 | 1 | Heat 5 | 
| -. Lum Zhaveli |  KOS | 24.88s | 1990 | 8 | Heat 5 | 
| -. Batsaikhan Dulguun |  MGL | 24.90s | 1986 | 0 | Heat 5 | 
| -. Hilal Hemed Hilal |  TAN | 24.93s | 1994 | 9 | Heat 5 | 
| -. Abeku Jackson |  GHA | 24.98s | 2000 | 4 | Heat 4 | 
| -. Valentin Gorshkov |  TKM | 25.00s | 1997 | 5 | Heat 4 | 
| -. Kerry Ollivierre |  GRN | 25.15s | 1999 | 3 | Heat 4 | 
| -. Noah Mascoll-Gomes |  ANT | 25.26s | 1999 | 6 | Heat 4 | 
| -. Mohammad Mahfizur Rahman |  BAN | 25.34s | 1993 | 2 | Heat 4 | 
| -. Ekirikubinza Joshua Tibatemwa |  UGA | 25.78s | 1996 | 7 | Heat 4 | 
| -. Giordan Harris |  MHL | 26.00s | 1993 | 1 | Heat 4 | 
| -. Sirish Gurung |  NEP | 26.10s | 1998 | 8 | Heat 4 | 
| -. Muhammad Saad |  PAK | 26.19s | 1998 | 0 | Heat 4 | 
| -. Abdelmalik Tofik Muktar |  ETH | 26.20s | 1996 | 9 | Heat 4 | 
| -. Temaruata Strickland |  COK | 26.21s | 1999 | 4 | Heat 3 | 
| -. Ibrahim Nishwan |  MDV | 26.40s | 1997 | 5 | Heat 3 | 
| -. Olim Kurbanov |  TJK | 26.53s | 1998 | 3 | Heat 3 | 
| -. Andrew Fowler |  GUY | 26.61s | 1995 | 6 | Heat 3 | 
| -. Dionisio Augustine |  FSM | 26.75s | 1992 | 2 | Heat 3 | 
| -. Billy-Scott Irakoze |  BDI | 27.02s | 1996 | 7 | Heat 3 | 
| -. Mohamed Muthasim Adnan |  MDV | 27.08s | 1997 | 1 | Heat 3 | 
| -. Tindwende Thierry Sawadogo |  BUR | 27.16s | 1995 | 8 | Heat 3 | 
| -. Shane Christopher Cadogan |  VIN | 27.27s | 2001 | 0 | Heat 3 | 
| -. Thonponloeu Hem |  CAM | 27.30s | 1990 | 9 | Heat 3 | 
| -. Jules Yao Bessan |  BEN | 27.33s | 1979 | 4 | Heat 2 | 
| -. Shawn Erbelau Dingilius Wallace |  PLW | 27.33s | 1994 | 5 | Heat 2 | 
| -. Takumi Sugie |  NMA | 27.56s | 1998 | 3 | Heat 2 | 
| -. Albarchir Mouctar |  NIG | 27.83s | 1995 | 6 | Heat 2 | 
| -. Brave Lifa |  MAW | 28.01s | 1995 | 2 | Heat 2 | 
| -. Patrick Rukundo |  RWA | 28.02s | 1980 | 7 | Heat 2 | 
| -. Abdelaziz M Ahmed |  SUD | 28.34s | 1994 | 8 | Heat 2 | 
| -. Santisouk Inthavong |  LAO | 28.34s | 1999 | 1 | Heat 2 | 
| -. Emeric Kpegba |  TOG | 29.10s | 1999 | 0 | Heat 2 | 
| -. Osman Kamara |  SLE | 29.42s | 1987 | 9 | Heat 2 | 
| -. Mael Ambonguilat |  GAB | 29.64s | 1997 | 4 | Heat 1 | 
| -. Mamadou A Soumare |  MLI | 30.00s | 1992 | 3 | Heat 1 | 
| -. Pap D Jonga |  GAM | 30.00s | 1997 | 5 | Heat 1 | 
| -. Amadou Camara |  GUI | 30.05s | 1994 | 6 | Heat 1 | 
| -. Charly Ndjoume |  CMR | 30.07s | 1986 | 2 | Heat 1 | 
| -. Ebrahim Esam Mohammed Al-Maleki |  YEM | 32.27s | 1994 | 7 | Heat 1 | 
| -. Shad Luis Perriere |  CAF | 35.18s | 2000 | 1 | Heat 1 | 
| -. Mokhoro Makara |  LES | 36.00s | 1994 | 8 | Heat 1 | 
| -. Ahmed Bourhan Alwan |  DJI | 40.50s | 1998 | 0 | Heat 1 | 
| -. Dienov Koka |  CGO | &s | 1996 | 9 | Heat 1 |