The Men's 100 metre butterfly competition at the 2017 World Championships was held on 28 and 29 July 2017.Schedule Start list

Records Prior to the competition, the existing world and championship records were as follows.

Results Heats The heats were held on 28 July at 10:10.Heats results

Rank Heat Lane Name Nationality Time Notes 1 6 4 50.08 Q 2 6 3 51.09 Q, NR 3 7 6 51.16 Q 4 8 4 51.21 Q 5 8 6 51.23 Q, WJ 6 8 5 51.28 Q 7 7 3 51.46 Q 8 6 6 51.48 Q 9 7 5 51.50 Q 10 7 4 51.55 Q 11 6 5 Li Zhuhao 51.62 Q 12 7 2 51.67 Q 13 6 7 51.82 Q 14 8 8 51.84 Q 15 8 2 51.90 Q 16 8 3 51.96 Q 17 7 0 52.12 18 8 1 Quah Zheng Wen 52.13 19 5 6 52.16 20 7 7 52.17 21 7 8 52.18 22 6 2 52.22 23 7 1 52.47 24 4 1 52.52 25 6 1 52.59 26 5 2 52.65 27 5 0 52.74 28 7 9 52.75 29 8 7 52.87 30 6 9 52.88 31 4 2 52.95 32 6 8 52.97 33 6 0 53.01 34 5 3 53.10 35 8 0 53.13 36 8 9 53.20 37 4 4 53.37 38 4 3 53.50 39 4 7 53.51 40 4 0 53.62 41 5 1 53.66 41 5 4 53.66 43 5 5 53.70 44 5 9 53.80 45 4 8 53.97 45 5 7 53.97 47 3 2 Chou Wei-liang 54.31 48 3 3 54.46 49 3 4 54.48 50 4 9 54.50 51 5 8 54.59 52 4 5 Hoàng Quý Phước 54.76 53 3 5 54.86 54 3 7 54.98 55 3 6 55.09 56 3 0 55.31 57 2 4 55.58 58 3 9 FINA Independent Athletes 55.66 59 3 8 55.85 60 3 1 56.59 61 2 3 56.88 62 2 5 57.52 63 2 1 57.90 64 1 3 58.01 65 2 2 58.29 66 1 5 58.42 67 2 6 58.69 68 1 4 58.79 69 1 6 1:03.28 70 2 9 1:04.02 71 2 7 1:06.80 72 2 0 1:07.11 4 6

Semifinals The semifinals were held on 28 July at 18:35.Semifinals results

Semifinal 1 Rank Lane Name Nationality Time Notes 1 5 Joseph Schooling 50.78 Q 2 2 László Cseh 51.16 Q 3 7 Grant Irvine 51.31 Q 4 8 Tim Phillips 51.41 5 4 Piero Codia 51.45 6 6 Henrique Martins 51.47 7 3 Chad le Clos 51.48 8 1 Aleksandr Popkov 52.00

Semifinal 2 Rank Lane Name Nationality Time Notes 1 4 Caeleb Dressel 50.07 Q 2 5 James Guy 50.67 Q, NR 3 3 Kristóf Milák 50.77 Q, WJ, NR 4 6 Mehdy Metella 51.06 Q, NR 5 7 Li Zhuhao 51.29 Q 6 2 Konrad Czerniak 51.60 7 8 David Morgan 51.73 8 1 Jan Świtkowski 52.02

Final The final was held on 29 July at 18:13.Final results

Rank Lane Name Nationality Time Notes 4 Caeleb Dressel 49.86 3 Kristóf Milák 50.62 WJ, NR 6 Joseph Schooling 50.83 5 James Guy 50.83 5 7 László Cseh 50.92 6 1 Li Zhuhao 50.96 7 8 Grant Irvine 51.00 8 2 Mehdy Metella 51.16

References