2018 Pan Pacific Swimming Championships – Women's 100 metre backstroke

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

World record	Kathleen Baker (USA)	58.00	Irvine, United States	28 July 2018
Pan Pacific Championships record	Emily Seebohm (AUS)	58.84	Gold Coast, Australia	21 August 2014

All times are in minutes and seconds.

Heats

The first round was held on 10 August from 10:00.^[3]

Only two swimmers from each country may advance to the A or B final. If a country not qualify any swimmer to the A final, that same country may qualify up to three swimmers to the B final.^[4]

Rank	Name	Nationality	Time	Notes
1	Kylie Masse	Canada	58.29	QA, CR
2	Kathleen Baker	United States	58.41	QA
3	Emily Seebohm	Australia	58.79	QA
4	Regan Smith	United States	59.27	QA
5	Natsumi Sakai	Japan	59.45	QA
6	Olivia Smoliga	United States	59.47	QB
7	Kaylee McKeown	Australia	59.91	QA
8	Anna Konishi	Japan	1:00.30	QA
9	Kennedy Goss	Canada	1:00.93	QA
10	Isabella Arcila	Colombia	1:01.54	QB
11	Alex Galyer	New Zealand	1:01.61	QB
12	Danielle Hanus	Canada	1:01.78	QB
13	Yang Yifan	China	1:02.20	QB
14	Chloe Isleta	Philippines	1:05.08	QB
15	Gianna Garcia	Philippines	1:12.93	QB
16	Osisang Chilton	Palau	1:18.54	QB
–	Taylor Ruck	Canada	DNS
–	Sayaka Akase	Japan	DNS
–	McKenna DeBever	Peru	DSQ

B Final

The B final was held on 10 August from 18:00.^[5]

Rank	Name	Nationality	Time	Notes
9	Olivia Smoliga	United States	59.20
10	Isabella Arcila	Colombia	1:01.39
11	Yang Yifan	China	1:01.58
12	Alex Galyer	New Zealand	1:01.67
13	Danielle Hanus	Canada	1:01.68
14	Chloe Isleta	Philippines	1:05.03
15	Gianna Garcia	Philippines	1:11.66
16	Osisang Chilton	Palau	1:17.14

A Final

The A final was held on 10 August from 18:00.^[6]

Rank	Name	Nationality	Time	Notes
	Kylie Masse	Canada	58.61
	Emily Seebohm	Australia	58.72
	Kathleen Baker	United States	58.83
4	Regan Smith	United States	58.95
5	Kaylee McKeown	Australia	59.25
6	Natsumi Sakai	Japan	59.33
7	Kennedy Goss	Canada	1:00.90
–	Anna Konishi	Japan	DSQ