Event 103 Mens 100 Metres Butterfly - Heats
| Name | Age | Federation | Seed | Heats | Split
|
| 1 | PUNINSKI, Alexei | 18 | Croatia | 54.66 | 55.30 | 24.87 | 55.30 |
| 2 | DIETRICH, Johannes | 18 | Germany | 53.91 | 55.43 | 26.28 | 55.43 |
| 2 | STARKE, Benjamin | 17 | Germany | 54.94 | 55.43 | 25.79 | 55.43 |
| 4 | LEVEAUX, Amaury | 17 | France | 54.78 | 55.47 | 26.02 | 55.47 |
| 5 | SALCIUS, Rimvydas | 18 | Lithuania | 53.66 | 55.54 | 25.91 | 55.54 |
| 6 | PASTRAS, Sotiris | 17 | Greece | 54.53 | 55.68 | 25.87 | 55.68 |
| 7 | FONTEYN, Mathieu | 18 | Belgium | 55.76 | 55.91 | 26.40 | 55.91 |
| 8 | MIZIAK, Bartlomiej | 18 | Poland | 55.43 | 55.95 | 25.93 | 55.95 |
| 9 | LEEL, Martin | 18 | Great Britain | 55.83 | 56.05 | 26.31 | 56.05 |
| 10 | MADARASSY, Adam | 18 | Hungary | 55.87 | 56.18 | 26.01 | 56.18 |
| 11 | KOCHAVI, Nadav | 18 | Israel | 56.31 | 56.19 | 26.27 | 56.19 |
| 11 | KISS, Boldizsar | 18 | Hungary | 55.92 | 56.19 | 26.67 | 56.19 |
| 13 | ARAUJO, Joao | 18 | Portugal | 56.45 | 56.25 | 26.47 | 56.25 |
| 14 | DOROKHOV, Nikita | 18 | Russia | 56.64 | 56.35 | 25.93 | 56.35 |
| 15 | GAYDAR, Kostantyn | 17 | Ukraine | 56.62 | 56.44 | 26.54 | 56.44 |
| 16 | LEWANDOWSKI, Maciej | 17 | Poland | 55.80 | 56.45 | 26.01 | 56.45 |
| 17 | YELISEYEU, Yauhen | 18 | Belarus | 55.72 | 56.62 | 26.64 | 56.62 |
| 18 | OBERHOLZER, Simon | 18 | Switzerland | 57.08 | 56.63 | 27.57 | 56.63 |
| 19 | DELIC, Nikola | 18 | Croatia | 56.95 | 56.89 | 26.78 | 56.89 |
| 20 | AMADOR, Luis | 18 | Portugal | 57.37 | 56.92 | 26.36 | 56.92 |
| 21 | SACHUK, Anton | 18 | Ukraine | 57.40 | 57.02 | 27.14 | 57.02 |
| 22 | ANDKJAER, Jakob S | 18 | Denmark | 56.33 | 57.05 | 25.87 | 57.05 |
| 23 | SJODIN, Samba | 18 | Sweden | 57.42 | 57.18 | 26.99 | 57.18 |
| 24 | REVERTE, Dan | 18 | Spain | 57.07 | 57.29 | 26.50 | 57.29 |
| 25 | URAS, Onur | 18 | Turkey | 56.15 | 57.34 | 26.90 | 57.34 |
| 26 | BARRABINO, Albert | 18 | Spain | 57.33 | 57.36 | 27.23 | 57.36 |
| 27 | DONOHOE, Michael | 17 | Ireland | 57.29 | 57.48 | 26.88 | 57.48 |
| 28 | KRYLOV, Roman | 17 | Estonia | 58.28 | 58.04 | 26.57 | 58.04 |
| 29 | HOLLAND, Cian | 18 | Ireland | 56.88 | 58.12 | 27.02 | 58.12 |
| 30 | ZGOMBA, Ivan | 18 | Serbia & Monte N | 58.20 | 58.15 | 27.28 | 58.15 |
| 31 | MELMER, Nicolas | 17 | Luxembourg | 58.01 | 58.67 | 27.70 | 58.67 |
| 32 | LITSHMAN, Maksim | 18 | Estonia | 59.02 | 59.50 | 27.59 | 59.50 |
| -- | BENATTI, Lorenzo | 17 | Italy | 56.07 | DQ | 26.61 | |