Swimming at the 2017 World Aquatics Championships – Men's 100 metre butterfly explained

Event:	Men's 100 metre butterfly
Championship:	2017 World Aquatics Championships
Dates:	28 July (heats and semifinals) 29 July (final)
Venue:	Danube Arena
Location:	Budapest, Hungary
Competitors:	73
Nations:	66
Win Value:	49.86
Gold:	Caeleb Dressel
Gold Nation:	USA
Silver:	Kristóf Milák
Silver Nation:	HUN
Bronze:	Joseph Schooling
Bronze Nation:	SIN
Bronze2:	James Guy
Bronze2 Nation:	GBR
Prev:	2015
Next:	2019

The Men's 100 metre butterfly competition at the 2017 World Championships was held on 28 and 29 July 2017.^[1] ^[2]

Records

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

The heats were held on 28 July at 10:10.^[3]

Rank	Heat	Lane	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	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	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	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	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	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

The semifinals were held on 28 July at 18:35.^[4]

Rank	Lane	Time	Notes
1	4	50.07	Q
2	5	50.67	Q, NR
3	3	50.77	Q, WJ, NR
4	6	51.06	Q, NR
5	7	51.29	Q
6	2	51.60
7	8	51.73
8	1	52.02

The final was held on 29 July at 18:13.^[5]