| | Event type
100 metres Breaststroke, Boys
| Date | 7 – 8 October 2018 |
|---|---|
| Status | YOG |
| Location | Natatorium, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires |
| Participants | 32 from 29 countries |
| Pos | Swimmer | NOC | R1 | SF | Final | |||
|---|---|---|---|---|---|---|---|---|
| 1 | Sun Jiajun |  CHN | 1:01.43 (1 h4) | 1:00.61 (1 h1) | 1:00.59 (1) | Gold | ||
| 2 | Denis Petrashov |  KGZ | 1:02.82 (3 h4) | 1:01.95 (2 h1) | 1:01.34 (2) | Silver | ||
| 3 | Taku Taniguchi |  JPN | 1:01.68 (2 h3) | 1:02.08 (2 h2) | 1:01.40 (3) | Bronze | ||
| 4 | Yu Hanaguruma | JPN | 1:02.22 (1 h2) | 1:01.99 (3 h1) | 1:01.62 (4) | |||
| 5 | Michael Houlie |  RSA | 1:01.37 (1 h3) | 1:00.23 (1 h2) | 1:01.70 (5) | |||
| 6 | Caspar Corbeau |  NED | 1:02.74 (3 h3) | 1:02.29 (4 h2) | 1:01.81 (6) | |||
| 7 | Vladislav Gerasimenko |  RUS | 1:02.46 (2 h2) | 1:02.15 (3 h2) | 1:02.43 (7) | |||
| 8 | Jan Kałusowski |  POL | 1:02.63 (2 h4) | 1:02.23 (4 h1) | 1:02.69 (8) | |||
| 9 | Phạm Thành Bảo |  VIE | 1:02.99 (3 h2) | 1:02.52 (5 h2) | – | |||
| 10 | Vitor de Souza |  BRA | 1:03.18 (4 h2) | 1:02.69 (5 h1) | – | |||
| 11 | Sebestyén Böhm |  HUN | 1:03.21 (4 h4) | 1:03.23 (6 h2) | – | |||
| 12 | Juri Dijkstra | NED | 1:03.53 (5 h4) | 1:03.10 (6 h1) | – | |||
| 13 | Santiago Saint-Upery |  URU | 1:03.55 (6 h4) | 1:03.84 (8 h2) | – | |||
| 14 | Demirkan Demir |  TUR | 1:03.68 (4 h3) | 1:04.05 (8 h1) | – | |||
| 15 | Moncef Balamane |  ALG | 1:03.72 (5 h3) | 1:03.35 (7 h2) | – | |||
| 16 | André Klippenberg Grindheim |  NOR | 1:03.80 (6 h3) | 1:03.65 (7 h1) | – | |||
| 17 | Alexander Milanovich |  CAN | 1:03.88 (7 h3) | – | – | |||
| 18 | Jānis Siliņš |  LAT | 1:04.06 (7 h4) | – | – | |||
| 19 | Maximillian Ang |  SGP | 1:04.24 (8 h3) | – | – | |||
| 20 | Aleksey Sidorchuk |  UZB | 1:04.31 (1 h1) | – | – | |||
| 21 | Marcus Mok |  HKG | 1:04.46 (5 h2) | – | – | |||
| 22 | Andrés Puente |  MEX | 1:04.69 (8 h4) | – | – | |||
| 23 | Ethan Dang |  USA | 1:04.72 (6 h2) | – | – | |||
| 24 | Dávid Gajdoš |  SVK | 1:04.87 (2 h1) | – | – | |||
| 25 | Didzis Rudavs | LAT | 1:04.95 (7 h2) | – | – | |||
| 26 | Matija Može |  SLO | 1:04.96 (3 h1) | – | – | |||
| 27 | Izaak Bastian |  BAH | 1:05.21 (8 h2) | – | – | |||
| 28 | Luis Weekes |  BAR | 1:06.27 (4 h1) | – | – | |||
| 29 | José David Solís |  CRC | 1:06.32 (5 h1) | – | – | |||
| 30 | Samuele Rossi |  SEY | 1:07.28 (6 h1) | – | – | |||
| 31 | Leonard Kalate |  PNG | 1:07.53 (7 h1) | – | – | |||
| 32 | Simon Greuter |  LIE | 1:08.12 (8 h1) | – | – |
Round One (7 October 2018 — 11:00)
Top 16 advance to the semi-finals.
Heat One (11:00)
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | – | Aleksey Sidorchuk | UZB | 1:04.31 | |||
| 2 | – | Dávid Gajdoš | SVK | 1:04.87 | |||
| 3 | – | Matija Može | SLO | 1:04.96 | |||
| 4 | – | Luis Weekes | BAR | 1:06.27 | |||
| 5 | – | José David Solís | CRC | 1:06.32 | |||
| 6 | – | Samuele Rossi | SEY | 1:07.28 | |||
| 7 | – | Leonard Kalate | PNG | 1:07.53 | |||
| 8 | – | Simon Greuter | LIE | 1:08.12 |
Heat Two
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | – | Yu Hanaguruma | JPN | 1:02.22 | |||
| 2 | – | Vladislav Gerasimenko | RUS | 1:02.46 | |||
| 3 | – | Phạm Thành Bảo | VIE | 1:02.99 | |||
| 4 | – | Vitor de Souza | BRA | 1:03.18 | |||
| 5 | – | Marcus Mok | HKG | 1:04.46 | |||
| 6 | – | Ethan Dang | USA | 1:04.72 | |||
| 7 | – | Didzis Rudavs | LAT | 1:04.95 | |||
| 8 | – | Izaak Bastian | BAH | 1:05.21 |
Heat Three
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | – | Michael Houlie | RSA | 1:01.37 | |||
| 2 | – | Taku Taniguchi | JPN | 1:01.68 | |||
| 3 | – | Caspar Corbeau | NED | 1:02.74 | |||
| 4 | – | Demirkan Demir | TUR | 1:03.68 | |||
| 5 | – | Moncef Balamane | ALG | 1:03.72 | |||
| 6 | – | André Klippenberg Grindheim | NOR | 1:03.80 | |||
| 7 | – | Alexander Milanovich | CAN | 1:03.88 | |||
| 8 | – | Maximillian Ang | SGP | 1:04.24 |
Heat Four
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | – | Sun Jiajun | CHN | 1:01.43 | |||
| 2 | – | Jan Kałusowski | POL | 1:02.63 | |||
| 3 | – | Denis Petrashov | KGZ | 1:02.82 | |||
| 4 | – | Sebestyén Böhm | HUN | 1:03.21 | |||
| 5 | – | Juri Dijkstra | NED | 1:03.53 | |||
| 6 | – | Santiago Saint-Upery | URU | 1:03.55 | |||
| 7 | – | Jānis Siliņš | LAT | 1:04.06 | |||
| 8 | – | Andrés Puente | MEX | 1:04.69 |
Semi-Finals (7 October 2018 — 18:38)
Top 8 advance to the final round.
Heat One (18:38)
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | – | Sun Jiajun | CHN | 1:00.61 | |||
| 2 | – | Denis Petrashov | KGZ | 1:01.95 | |||
| 3 | – | Yu Hanaguruma | JPN | 1:01.99 | |||
| 4 | – | Jan Kałusowski | POL | 1:02.23 | |||
| 5 | – | Vitor de Souza | BRA | 1:02.69 | |||
| 6 | – | Juri Dijkstra | NED | 1:03.10 | |||
| 7 | – | André Klippenberg Grindheim | NOR | 1:03.65 | |||
| 8 | – | Demirkan Demir | TUR | 1:04.05 |
Heat Two
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | – | Michael Houlie | RSA | 1:00.23 | |||
| 2 | – | Taku Taniguchi | JPN | 1:02.08 | |||
| 3 | – | Vladislav Gerasimenko | RUS | 1:02.15 | |||
| 4 | – | Caspar Corbeau | NED | 1:02.29 | |||
| 5 | – | Phạm Thành Bảo | VIE | 1:02.52 | |||
| 6 | – | Sebestyén Böhm | HUN | 1:03.23 | |||
| 7 | – | Moncef Balamane | ALG | 1:03.35 | |||
| 8 | – | Santiago Saint-Upery | URU | 1:03.84 |
Final Round (8 October 2018 — 19:02)
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | – | Sun Jiajun | CHN | 1:00.59 | |||
| 2 | – | Denis Petrashov | KGZ | 1:01.34 | |||
| 3 | – | Taku Taniguchi | JPN | 1:01.40 | |||
| 4 | – | Yu Hanaguruma | JPN | 1:01.62 | |||
| 5 | – | Michael Houlie | RSA | 1:01.70 | |||
| 6 | – | Caspar Corbeau | NED | 1:01.81 | |||
| 7 | – | Vladislav Gerasimenko | RUS | 1:02.43 | |||
| 8 | – | Jan Kałusowski | POL | 1:02.69 |