Swimming at the 2009 World Aquatics Championships – Women's 50 metre backstroke explained

See main article: Swimming at the 2009 World Aquatics Championships.

The heats for the women's 50 m backstroke race at the 2009 World Championships took place in the morning and evening of 29 July, with the final in the evening session of 30 July at the Foro Italico in Rome, Italy.

Records

Prior to this competition, the existing world and competition records were as follows:

World record	27.61	align=right	26 June 2009
Championship record	28.16	align=right	28 March 2007
Championship record	28.16	29 March 2007

The following records were established during the competition:

Date	Round	Time	Record
28 July	Final*	28.13	CR
29 July	Heat 12	27.85	CR
29 July	Heat 13	27.65	CR
29 July	Semifinal 1	27.39	WR
29 July	Semifinal 2	27.38	WR
30 July	Final	27.06	WR

* Split from the women's 100 m backstroke

Results

Heats

Rank	Time	Heat	Lane	Notes
1	27.65	13	2	CR
2	27.70	13	4
2	27.70	14	4
4	27.82	14	3
5	27.85	12	4
6	27.88	12	5
7	27.94	14	2	SA
8	27.95	13	5
9	28.02	14	5
10	28.19	12	3
11	28.23	12	6
12	28.25	13	6
13	28.27	12	7	NR
14	28.28	12	2
15	28.31	13	3
16	28.51	14	6
17	28.55	12	9	NR
18	28.72	14	8	NR
19	28.78	13	7
20	28.80	13	8
21	28.82	14	7
22	28.86	11	6
23	29.01	14	1
24	29.05	14	9
25	29.07	12	8
26	29.08	11	2
27	29.09	11	5
27	29.09	13	1
29	29.12	11	4
29	29.12	12	1
31	29.13	10	3	NR
32	29.14	11	8
33	29.19	14	0
34	29.20	10	5
34	29.20	11	7	=NR
36	29.26	10	6
36	29.26	11	1
38	29.28	8	4
39	29.45	11	3
40	29.49	9	0
41	29.51	11	9
41	29.51	13	9
43	29.55	10	8	NR
44	29.57	10	4
45	29.58	7	0	NR
46	29.69	10	9
47	29.70	11	0
48	29.73	10	0
49	29.74	13	0
50	29.77	9	2
51	29.83	9	3
51	29.83	9	9	NR
53	29.84	12	0
54	29.90	9	5
55	29.91	10	1
56	29.92	9	6
57	29.93	10	2
58	30.02	9	4
59	30.22	8	3
60	30.26	10	7
61	30.29	8	1
62	30.32	9	8
63	30.39	7	2	NR
64	30.42	8	6
65	30.48	9	7
66	30.49	2	1
67	30.52	8	5
68	30.59	7	9
69	30.63	9	1
70	30.88	7	6
71	30.92	7	3
72	30.95	8	2
73	30.98	5	8
74	31.08	7	4
75	31.11	8	7
76	31.18	8	8
77	31.30	6	4	NR
78	31.53	8	0
79	31.56	7	1
80	31.84	3	4
81	32.04	6	2
82	32.05	7	7
83	32.06	5	4
83	32.06	7	5
85	32.15	4	2
86	32.16	6	7
87	32.19	6	9
88	32.20	5	5
89	32.27	6	0
90	32.33	6	6
91	32.34	6	5
92	32.36	6	8
93	32.47	7	8
94	32.57	5	6
95	32.69	8	9
96	32.92	4	5
97	32.95	5	9
98	33.03	5	1
99	33.04	4	4
100	33.07	5	2
101	33.10	2	4	NR
102	33.39	6	3
103	33.41	5	3
104	33.73	4	8
105	33.75	5	7
106	33.80	3	6
107	33.96	6	1
108	34.01	4	0
109	34.22	3	2
110	34.23	4	3
111	34.67	4	7
112	34.83	3	3
113	34.89	3	8
114	35.00	5	0
115	35.02	3	7
116	35.20	4	1
117	35.25	4	6
118	35.79	4	9
119	35.87	2	7
120	35.99	2	5
121	36.32	1	5
122	36.34	3	5
123	36.57	3	1
124	36.60	3	0
125	36.61	2	2
125	36.61	2	8
127	36.83	3	9
128	37.07	1	3
129	37.29	2	3
130	37.64	2	6
131	38.25	1	4
132	40.80	2	0
–	DSQ	1	6

Semifinals

Rank	Time	Heat	Lane	Notes
1	27.38	2	5	WR
2	27.39	1	4	NR
3	27.51	1	5	OC
4	27.57	2	4
5	27.59	2	3	AS
6	27.66	2	2
7	27.70	1	7
7	27.70	2	6	AM
9	27.73	1	6	NR
10	27.77	2	7	NR
11	27.83	1	3
12	27.88	2	8
13	27.92	1	2	NR
14	28.19	1	1
15	28.28	1	8
16	28.32	2	1

Final

Rank	Time	Lane	Notes
	27.06	2	WR
	27.23	5	ER
	27.28	7
4	27.31	4	NR
5	27.62	6
6	27.73	3
7	27.83	1
8	27.88	8