Heat 13
jeudi 13 décembre 2018, 03h17 GMT – 03h17 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Caeleb Dressel | United States | 20.62″ |
| 2 |  Vladimir Morozov | Russia | + 0.27″ |
| 3 |  Cameron McEvoy | Australia | + 0.35″ |
| 4 | Michael Andrew | United States | + 0.63″ |
| 5 | Sergiy Shevtsov | Ukraine | + 0.69″ |
| 6 | Kosuke Matsui | Japan | + 0.72″ |
| 7 | Brad Tandy | South Africa | + 0.76″ |
| 8 | Cameron Jones | Australia | + 0.89″ |
| 9 |  Ari-Pekka Liukkonen | Finland | + 0.95″ |
| 10 |  Matheus Santana | Brazil | + 1.09″ |