| Final 12.08 Night | time | gap | L | React. |  50m |  | 1. Joseph Schooling |  SGP | 50.39s | OR |   | 0.61 | 23.64s | 1. |  | 2. Michael Phelps |  USA | 51.14s | 0.75 |   | 0.70 | 24.16s | 6. |  | 2. Chad le Clos |  RSA | 51.14s | 0.75 |   | 0.61 | 24.09s | 5. |  | 2. Laszlo Cseh |  HUN | 51.14s | 0.75 |   | 0.69 | 24.06s | 4. |  | 5. Zhuhao Li |  CHN | 51.26s | 0.87 |   | 0.70 | 24.04s | 3. |  | 6. Mehdy Metella |  FRA | 51.58s | 1.19 |   | 0.70 | 24.24s | 7. |  | 7. Tom Shields |  USA | 51.73s | 1.34 |   | 0.74 | 24.28s | 8. |  | 8. Aleksandr Sadovnikov |  RUS | 51.84s | 1.45 |   | 0.68 | 23.96s | 2. |   
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| Ranking | time | gap | React | 50m | HR | Semi |  | 1. Joseph Schooling |  SGP | 50.83s |   | 0.61 | 23.81s | 1. | 2 |  | 2. Chad le Clos |  RSA | 51.43s | 0.60 | 0.65 | 24.01s | 2. | 2 |  | 3. Zhuhao Li |  CHN | 51.51s | 0.68 | 0.68 | 24.11s | 3. | 2 |  | 4. Laszlo Cseh |  HUN | 51.57s | 0.74 | 0.78 | 24.24s | 1. | 1  |  | 5. Michael Phelps |  USA | 51.58s | 0.75 | 0.67 | 24.47s | 2. | 1  |  | 6. Tom Shields |  USA | 51.61s | 0.78 | 0.77 | 24.16s | 4. | 2  |  | 7. Aleksandr Sadovnikov |  RUS | 51.71s | 0.88 | 0.67 | 23.65s | 5. | 2  |  | 8. Mehdy Metella |  FRA | 51.73s | 0.90 | 0.66 | 24.17s | 6. | 2  |  |  eliminated |  | 9. David Morgan |  AUS | 51.75s | 0.92 | 0.63 | 24.48s | 7. | 2  |  | 10.Konrad Czerniak |  POL | 51.80s | 0.97 | 0.70 | 23.81s | 3. | 1  |  | 11.Piero Codia |  ITA | 51.82s | 0.99 | 0.67 | 23.73s | 4. | 1  |  | 12.Santo Condorelli |  CAN | 51.83s | 1.00 | 0.65 | 23.97s | 5. | 1  |  | 13.Grant Irvine |  AUS | 51.87s | 1.04 | 0.68 | 24.42s | 6. | 1  |  | 14.James Guy |  GBR | 52.10s | 1.27 | 0.64 | 24.30s | 7. | 1  |  | 15.Zheng Wen Quah |  SGP | 52.26s | 1.43 | 0.64 | 24.29s | 8. | 1  |  |  below Olympic Qualifyng Time 52.36s. |  | 16.Evgeny Koptelov |  RUS | 52.50s | 1.67 | 0.73 | 24.94s | 8. | 2  |   
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| Ranking | time | gap | React | 50m | HR |  | 1. Joseph Schooling |  SGP | 51.41s |   | 0.61 | 24.21s | 1. |  | 2. Laszlo Cseh |  HUN | 51.52s | 0.11 | 0.75 | 24.23s | 1. |  | 3. Tom Shields |  USA | 51.58s | 0.17 | 0.78 | 24.34s | 1. |  | 4. Michael Phelps |  USA | 51.60s | 0.19 | 0.75 | 24.50s | 2. |  | 5. Mehdy Metella |  FRA | 51.71s | 0.30 | 0.66 | 24.10s | 2. |  | 6. Piero Codia |  ITA | 51.72s | 0.31 | 0.65 | 23.70s | 2. |  | 7. Chad le Clos |  RSA | 51.75s | 0.34 | 0.65 | 24.25s | 3. |  | 8. James Guy |  GBR | 51.78s | 0.37 | 0.64 | 24.42s | 1. |  | 8. Zhuhao Li |  CHN | 51.78s | 0.37 | 0.73 | 24.64s | 3. |  | 10.Konrad Czerniak |  POL | 51.81s | 0.40 | 0.71 | 23.83s | 3. |  | 10.David Morgan |  AUS | 51.81s | 0.40 | 0.67 | 24.72s | 4. |  | 12.Grant Irvine |  AUS | 51.84s | 0.43 | 0.69 | 24.31s | 4. |  | 13.Aleksandr Sadovnikov |  RUS | 51.91s | 0.50 | 0.68 | 23.99s | 5. |  | 14.Santo Condorelli |  CAN | 51.99s | 0.58 | 0.65 | 24.45s | 1. |  | 15.Evgeny Koptelov |  RUS | 52.01s | 0.60 | 0.74 | 24.60s | 4. |  | 16.Zheng Wen Quah |  SGP | 52.08s | 0.67 | 0.63 | 24.27s | 2. |  |  eliminated |  | 17.Jeremy Stravius |  FRA | 52.10s | 0.69 | 0.70 | 24.30s | 5. |  | 18.Steffen Deibler |  GER | 52.14s | 0.73 | 0.64 | 24.05s | 6. |  | 19.Luis Carlos Martinez |  GUA | 52.22s | 0.81 | 0.64 | 24.57s | 3. |  | 20.Takuro Fujii |  JPN | 52.36s | 0.95 | 0.64 | 24.49s | 6. |  |  below Olympic Qualifyng Time 52.36s. |  | 21.Henrique Martins |  BRA | 52.42s | 1.01 | 0.69 | 24.78s | 4. |  | 22.Joeri Verlinden |  NED | 52.48s | 1.07 | 0.68 | 24.49s | 5. |  | 23.Lyubomyr Lemeshko |  UKR | 52.51s | 1.10 | 0.67 | 24.09s | 5. |  | 24.Santiago Grassi |  ARG | 52.56s | 1.15 | 0.64 | 24.41s | 7. |  | 25.Matteo Rivolta |  ITA | 52.67s | 1.26 | 0.67 | 24.50s | 6. |  | 26.Bence Pulai |  HUN | 52.73s | 1.32 | 0.72 | 24.38s | 7. |  | 27.Qibin Zhang |  CHN | 52.84s | 1.43 | 0.70 | 24.53s | 6. |  | 28.Pavel Sankovich |  BLR | 53.00s | 1.59 | 0.71 | 24.47s | 8. |  | 29.Albert Subirats |  VEN | 53.23s | 1.82 | 0.69 | 24.60s | 7. |  | 30.Ryan Pini |  PNG | 53.24s | 1.83 | 0.70 | 24.59s | 2. |  | 30.Yauhen Tsurkin |  BLR | 53.24s | 1.83 | 0.65 | 24.44s | 8. |  | 32.Long Yuan Miguel Gutierrez Feng |  MEX | 53.34s | 1.93 | 0.65 | 24.62s | 7. |  | 33.Pawel Korzeniowski |  POL | 53.71s | 2.30 | 0.74 | 25.00s | 8. |  | 34.Marcos Macedo |  BRA | 53.87s | 2.46 | 0.65 | 24.57s | 8. |  |  below Olympic Selection Time (OST) 54.19s. |  | 35.Glenn Victor Sutanto |  INA | 54.25s | 2.84 | 0.67 | 25.41s | 3. |  | 36.Abbas Qali |  KUW | 54.63s | 3.22 | 0.61 | 25.33s | 4. |  | 37.Anthonny Sitraka Ralefy |  MAD | 54.72s | 3.31 | 0.62 | 24.94s | 5. |  | 38.Ralph Goveia |  ZAM | 54.84s | 3.43 | 0.61 | 25.22s | 6. |  | 39.Allan Gutierrez |  HON | 55.20s | 3.79 | 0.67 | 25.35s | 7. |  | 40.Rami Anis |  SYR | 56.23s | 4.82 | 0.75 | 25.94s | 8. |  | 41.Oumar Toure |  MLI | 57.56s | 6.15 | 0.71 | 26.09s | 1. |  | 42.Hannibal David Gaskin |  GUY | 58.57s | 7.16 | 0.60 | 27.02s | 2. |  | 43.Myat Thint |  MYA | 1:02.54 | 11.13 | 0.77 | 29.22s | 3. |   
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| Olympic Qualifyng Time (OQT) 52.36s - NOC can enter up to 2 swimmers with OQT. |  | Olympic Selection Time (OST) 54.19s, invitational - A swwimer meeting the "invitation" standard was eligible for entry. But this entry was allotted/filled by ranking.  |   
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|  Olympic Qualifyng Time by NOC - 32 Swimmers - additional 11 Swimmers. |  |  2 Quotas - 11 NOC |  |  Olympic Qualifying Time - 52.36s |  | 2 |  Australia | Grant Irvine | David Morgan |  | 2 |  Belarus | Pavel Sankovich | Yauhen Tsurkin |  | 2 |  Brazil | Marcos Macedo | Henrique Martins |  | 2 |  China | Li Zhuhao | Zhang Qibin |  | 2 |  France | Mehdy Metella | Jérémy Stravius |  | 2 |  Hungary | Cseh László | Bence Pulai |  | 2 |  Italy | Piero Codia | Matteo Rivolta |  | 2 |  Poland | Konrad Czerniak | Paweł Korzeniowski |  | 2 |  Russia | Evgeny Koptelov | Aleksandr Sadovnikov |  | 2 |  Singapore | Quah Zheng Wen | Joseph Schooling |  | 2 |  United_States | Michael Phelps | Tom Shields |  |  1 Quota - 10 NOC |  | 1 |  Argentina | Santiago Grassi |  | 1 |  Germany | Steffen Deibler |  | 1 |  Great_Britain | James Guy |  | 1 |  Guatemala | Luis Martínez |  | 1 |  Japan | Takuro Fujii |  | 1 |  Mexico | Long Yuan Gutiérrez |  | 1 |  Netherlands | Joeri Verlinden |  | 1 |  South_Africa | Chad Le Clos |  | 1 |  Ukraine | Lyubomyr Lemeshko |  | 1 |  Venezuela | Albert Subirats |  |  Olympic Selection Time – 54.19 - 3 NOC |  | 1 |  Canada | Santo Condorelli | [a] |  | 1 |  Indonesia | Glenn Victor Sutanto |  | 1 |  Papua New Guinea | Ryan Pini | [b] |  |  Universalitiy Places - 8 NOC |  | 1 |  Guyana | Hannibal Gaskin |  | 1 |  Honduras | Allan Gutiérrez |  | 1 |  Kuwait | Abbas Qali |  | 1 |  Madagascar | Ralefy Anthonny Sitraka |  | 1 |  Mali | Omar Touré |  | 1 |  Myanmar | Myat Thint |  | 1 |  Refugee   | Olympic | Athletes | Rami Anis |  | 1 |  Zambia | Ralph Goveia |  | 43 | Total |   
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