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

The heats were held on 24 July at 09:47.[3]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	4	4	Xu Jiayu	China	52.77	Q
2	5	5	Matt Grevers	United States	52.92	Q
3	4	5	Grigory Tarasevich	Russia	53.18	Q
4	5	4	Ryan Murphy	United States	53.26	Q
5	5	3	Ryosuke Irie	Japan	53.54	Q
6	4	3	Apostolos Christou	Greece	53.55	Q
7	3	4	Mitch Larkin	Australia	53.72	Q
7	3	5	Guilherme Guido	Brazil	53.72	Q
9	3	2	Corey Main	New Zealand	53.97	Q
10	3	3	Li Guangyuan	China	54.04	Q
11	3	1	Matteo Milli	Italy	54.17	Q
12	4	2	Tomasz Polewka	Poland	54.30	Q
13	3	6	Shane Ryan	Ireland	54.33	Q
14	5	1	Yakov Toumarkin	Israel	54.39	Q
15	5	6	Javier Acevedo	Canada	54.43	Q
16	4	6	Kliment Kolesnikov	Russia	54.51	Q
17	4	7	Radosław Kawęcki	Poland	54.52
18	4	8	Quah Zheng Wen	Singapore	54.68
19	5	7	Mikita Tsmyh	Belarus	54.69
20	5	2	Zac Incerti	Australia	54.82
21	3	7	Gábor Balog	Hungary	54.88
22	5	8	Marek Ulrich	Germany	54.90
23	4	1	Hugo González	Spain	55.05
24	3	8	Youssef Abdalla	Egypt	55.60
25	2	6	Gytis Stankevičius	Lithuania	55.80
25	4	9	Ralf Tribuntsov	Estonia	55.80
27	2	5	Charles Hockin	Paraguay	55.81	NR
27	3	0	I Gede Siman Sudartawa	Indonesia	55.81
29	3	9	Anton Loncar	Croatia	55.88
30	4	0	Gabriel Lópes	Portugal	55.99
31	5	0	Dmytro Gurnytskyi	Ukraine	56.05
32	2	3	Girts Feldberg	Latvia	56.24
33	2	4	Geoffroy Mathieu	France	56.38
34	5	9	Lê Nguyễn Paul	Vietnam	56.64
35	2	7	Christopher Courtis	Barbados	57.23
36	2	8	Driss Lahrichi	Morocco	57.46
37	1	4	Mehdi Benbara	Algeria	57.59
38	1	1	Adel El-Fakir	Libya	58.48
39	2	9	Madhu Prathapan	India	58.49
40	1	6	Ronan Wantenaar	Namibia	58.91
41	1	3	Eisner Barberena	Nicaragua	59.82
42	2	1	Boris Kirillov	Azerbaijan	1:00.07
43	1	2	Steven Maina	Kenya	1:00.55
44	2	0	David van der Colff	Botswana	1:00.56
45	1	7	Juwel Ahmmed	Bangladesh	1:03.55
46	1	8	Boldbaataryn Buyantogtokh	Mongolia	1:04.52
—	1	5	Yaaqoub Al-Saadi	United Arab Emirates	DNS

The semifinals were held on 24 July at 17:48.[4]

The final was held on 25 July at 18:36.[5]

Rank	Lane	Name	Nationality	Time	Notes
	4	Xu Jiayu	China	52.44
	3	Matt Grevers	United States	52.48
	5	Ryan Murphy	United States	52.59
4	6	Ryosuke Irie	Japan	53.03
5	2	Grigory Tarasevich	Russia	53.12
6	7	Mitch Larkin	Australia	53.24
7	1	Guilherme Guido	Brazil	53.66
8	8	Corey Main	New Zealand	53.87