# Swimming at the 2010 Summer Youth Olympics – Boys' 100 metre butterfly

The men's 100 metre butterfly event at the 2010 Youth Olympic Games took place on August 16, at the Singapore Sports School.

## Medalists

| Gold | Gyucheol Chang South Korea | 53.13 |
| Silver | Chad le Clos South Africa | 53.31 |
| Bronze | Velimir Stjepanović Serbia | 53.77 |

## Heats
### Heat 1

| Rank | Lane | Name | Nationality | Time |
| 1 | 3 | Tsilavina Andritina Ramanantsoa | Madagascar | 1:06.88 |
| 2 | 4 | Cristofer Jimenez | Nicaragua | 1:07.64 |
| 3 | 6 | Ham Sserunjogi | Uganda | 1:11.23 |
| 4 | 5 | Ralph Benjamin Teiko Quaye | Ghana | 1:17.03 |

### Heat 2

| Rank | Lane | Name | Nationality | Time |
| 1 | 3 | Zlatko Alić | Bosnia and Herzegovina | 57.46 |
| 2 | 4 | Serghei Golban | Moldova | 57.81 |
| 3 | 5 | Ahmadreza Jalali | Iran | 57.84 |
| 4 | 6 | Homayoun Haghighijadid | Iran | 58.34 |
| 5 | 8 | Sofyan El Gadi | Libya | 59.07 |
| 6 | 2 | Omar Mithqal | Jordan | 59.39 |
| 7 | 7 | Juwel Ahmed | Bangladesh | 1:02.97 |
| 8 | 1 | Jeremy Joint Riong | Brunei | 1:11.27 |

### Heat 3

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | Kenneth To | Australia | 54.16 | Q |
| 2 | 2 | Jordan Coehlo | France | 54.19 | Q |
| 3 | 4 | Marcin Cieślak | Poland | 54.64 | Q |
| 4 | 3 | Roberto Sterlkov | Argentina | 55.15 | Q |
| 5 | 5 | Bowei Sun | China | 55.30 | Q |
| 6 | 6 | Melvin Herrmann | Germany | 55.65 | Q |
| 7 | 7 | Justin James | Australia | 55.70 | |
| 8 | 8 | Juan Manuel Arbelaez | Colombia | 58.37 | |

### Heat 4

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | Velimir Stjepanović | Serbia | 54.71 | Q |
| 2 | 7 | Hoang Quy Phuoc | Vietnam | 54.74 | Q |
| 3 | 5 | Bence Biczó | Hungary | 54.76 | Q |
| 4 | 4 | Mehdy Metella | France | 54.81 | Q |
| 5 | 2 | Kyusang Yoo | South Korea | 55.58 | Q |
| 6 | 6 | Ilya Lemaev | Russia | 55.77 | |
| 7 | 1 | Thomas Jobin | Canada | 56.80 | |
| 8 | 8 | Rainer Kai Wee Ng | Singapore | 57.06 | |

### Heat 5

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | Erich Peske | United States | 54.50 | Q |
| 2 | 5 | Gyucheol Chang | South Korea | 54.66 | Q |
| 3 | 6 | Chad le Clos | South Africa | 54.93 | Q |
| 4 | 4 | Tommaso Romani | Italy | 55.10 | Q |
| 5 | 7 | Cadell Lyons | Trinidad and Tobago | 55.54 | Q |
| 6 | 2 | Jun Isaji | Japan | 55.88 | |
| 7 | 1 | Sheng Jun Pang | Singapore | 57.08 | |
| 8 | 8 | Ondrej Palatka | Czech Republic | 57.41 | |

## Semifinals
### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | Chad le Clos | South Africa | 53.67 | Q |
| 2 | 3 | Velimir Stjepanović | Serbia | 54.00 | Q |
| 3 | 6 | Bence Biczó | Hungary | 54.03 | Q |
| 4 | 4 | Jordan Coehlo | France | 54.11 | Q |
| 5 | 5 | Marcin Cieślak | Poland | 54.30 | Q |
| 6 | 1 | Cadell Lyons | Trinidad and Tobago | 54.88 | |
| 7 | 8 | Melvin Herrmann | Germany | 55.19 | |
| 8 | 7 | Roberto Sterlkov | Argentina | 55.20 | |

### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | Gyucheol Chang | South Korea | 53.41 | Q |
| 2 | 5 | Erich Peske | United States | 54.29 | Q |
| 3 | 2 | Mehdy Metella | France | 54.30 | Q |
| 4 | 7 | Tommaso Romani | Italy | 54.35 | |
| 5 | 4 | Kenneth To | Australia | 54.36 | |
| 6 | 6 | Hoang Quy Phuoc | Vietnam | 54.71 | |
| 7 | 1 | Bowei Sun | China | 54.73 | |
| 8 | 8 | Kyusang Yoo | South Korea | 55.16 | |

## Final

| Rank | Lane | Name | Nationality | Time |
| | 4 | Gyucheol Chang | South Korea | 53.13 |
| | 5 | Chad le Clos | South Africa | 53.31 |
| | 3 | Velimir Stjepanović | Serbia | 53.77 |
| 4 | 1 | Marcin Cieślak | Poland | 53.78 |
| 5 | 2 | Jordan Coehlo | France | 53.96 |
| 6 | 6 | Bence Biczó | Hungary | 53.99 |
| 7 | 8 | Mehdy Metella | France | 54.35 |
| 8 | 7 | Erich Peske | United States | 54.93 |