The men's 100 metre backstroke event at the 2010 FINA World Swimming Championships (25 m) was held 15 December – 16 December. The heats and semifinals were held on 15 December. The final was held on 16 December.

Records

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

	Name	Nation	Time	Location	Date
World record	Nick Thoman Nick Thoman Nicholas Thoman is an American backstroke swimmer. He currently holds the world record in the 100-meter backstroke ....		48.94	Manchester Manchester Manchester is a city and metropolitan borough in Greater Manchester, England. According to the Office for National Statistics, the 2010 mid-year population estimate for Manchester was 498,800. Manchester lies within one of the UK's largest metropolitan areas, the metropolitan county of Greater...	18 December 2009
Championship record	Ryan Lochte Ryan Lochte Ryan Steven Lochte is an American swimmer and a six-time Olympic medalist . As part of the American team, he holds the world record in the 4×200-meter freestyle relay...		49.99	Shanghai Shanghai Shanghai is the largest city by population in China and the largest city proper in the world. It is one of the four province-level municipalities in the People's Republic of China, with a total population of over 23 million as of 2010...	9 April 2006

The following records were established during the competition:

Date	Round	Name	Nation	Time	WR	CR
15 December 2010	Semifinals	Stanislav Donets Stanislav Donets Stanislav Donets is a Russian swimmer from Dimitrovgrad. He was the world record holder for the 100m backstroke .-References:...		49.62		CR
16 December 2010	Final	Stanislav Donets Stanislav Donets Stanislav Donets is a Russian swimmer from Dimitrovgrad. He was the world record holder for the 100m backstroke .-References:...		49.07		CR

Heats

73 swimmers participated in 10 heats, qualified swimmers are listed:

Rank	Heat	Lane	Name	Time	Notes
1	10	4		50.18	Q
2	9	5		50.63	Q
3	8	6		50.74	Q
4	8	2		50.93	Q
5	8	4		51.03	Q
6	9	6		51.32	Q
7	9	3		51.34	Q
8	10	3		51.41	Q
9	6	6		51.42	Q
10	9	4		51.67	Q
11	1	4		51.70	Q
12	8	5		51.74	Q
13	9	2		51.84	Q
14	10	1		52.00	Q
15	8	3		52.03	Q
16	9	8		52.20	Q
17	10	6		52.37
18	7	6		52.43	SB
19	10	5		52.48
20	8	7		52.50
21	9	7		52.53
22	7	3		52.62
23	10	7		52.62
24	10	8		52.65
25	10	2		52.93

Semifinal 1

Rank	Lane	Name	Time	Notes
1	5		50.69	Q
2	4		50.75	Q
3	7		50.83	Q
4	3		50.98	Q
5	6		50.99
6	2		51.11
7	1		51.81
–	8			DNS

Semifinal 2

Rank	Lane	Name	Time	Notes
1	4		49.62	Q, CR
2	6		50.53	Q
3	3		50.90	Q
4	5		50.94	Q
5	2		51.48
6	8		51.86
7	7		51.92
8	1		52.13

Final

Rank	Lane	Name	Time	Notes
	4		49.07	CR
	5		49.80
	7		50.04
4	3		50.38
5	8		50.55
6	1		50.59
7	6		50.79
8	2		50.91

External links

• 2010 FINA World Swimming Championships (25 m): Men's 100 m backstroke entry list, from OmegaTiming.com; retrieved 2010-12-13.