| Competition | 2018 Pan Pacific Swimming Championships | 
|---|---|
| Venue | 
Tokyo
 | 
| Held | 10 August 2018 | 
| Status | Medal | 
| Competitors | 33 | 
| Countries | 8 | 
| Pos | Athlete(s) | Country | Preliminary Round | Final | ||
|---|---|---|---|---|---|---|
| 🥇 | Cate Campbell | 53.27 (2 h1)  | 
52.03 (1 FA)  | 
|||
| 🥈 | Simone Manuel | 53.23 (1 h1)  | 
52.66 (2 FA)  | 
|||
| 🥉 | Taylor Ruck | 53.34 (4 h1)  | 
52.72 (3 FA)  | 
|||
| 4 | Mallory Comerford | 53.30 (3 h1)  | 
52.94 (4 FA)  | 
|||
| 5 | Rikako Ikee | 54.14 (=10 h1)  | 
53.14 (5 FA)  | 
|||
| 6 | Kayla Sanchez | 54.02 (=7 h1)  | 
53.68 (6 FA)  | 
|||
| 7 | Shayna Jack | 53.61 (5 h1)  | 
53.74 (7 FA)  | 
|||
| 8 | Larissa Oliveira | 54.68 (16 h1)  | 
54.78 (8 FA)  | 
|||
| 9 | Emma McKeon | 53.97 (6 h1)  | 
53.37 (1 FB)  | 
|||
| 10 | Kelsi Worrell | 54.09 (9 h1)  | 
54.33 (2 FB)  | 
|||
| 11 | Margo Geer | 54.02 (=7 h1)  | 
54.47 (3 FB)  | 
|||
| 12 | Brianna Throssell | 54.93 (=18 h1)  | 
54.50 (4 FB)  | 
|||
| 13 | Tomomi Aoki | 54.84 (17 h1)  | 
54.69 (5 FB)  | 
|||
| 14 | Rebecca Smith | 54.54 (15 h1)  | 
54.72 (6 FB)  | 
|||
| 15 | Chihiro Igarashi | 54.96 (20 h1)  | 
55.05 (7 FB)  | 
|||
| 16 | Alexia Zevnik | 54.93 (=18 h1)  | 
55.45 (8 FB)  | 
|||
| 17 | Katie McLaughlin | 54.14 (=10 h1)  | 
— | |||
| 18 | Madeline Groves | 54.18 (12 h1)  | 
— | |||
| 19 | Abbey Weitzeil | 54.20 (13 h1)  | 
— | |||
| 20 | Allison Schmitt | 54.53 (14 h1)  | 
— | |||
| 21 | Gabby DeLoof | 55.22 (21 h1)  | 
— | |||
| 22 | Mayuka Yamamoto | 55.32 (22 h1)  | 
— | |||
| 23 | Kyla Leibel | 55.37 (23 h1)  | 
— | |||
| 24 | Rio Shirai | 55.44 (24 h1)  | 
— | |||
| 25 | Sarah Fournier | 55.57 (25 h1)  | 
— | |||
| 26 | Yui Yamane | 55.73 (26 h1)  | 
— | |||
| 27 | Lorrane Ferreira | 56.50 (27 h1)  | 
— | |||
| 28 | Ai Soma | 57.13 (28 h1)  | 
— | |||
| 29 | Nicole Oliva | 57.17 (29 h1)  | 
— | |||
| 30 | Miranda Renner | 1:00.05 (30 h1)  | 
— | |||
| 31 | Mineri Gomez | 1:04.40 (31 h1)  | 
— | |||
| 32 | Gianna Garcia | 1:04.54 (32 h1)  | 
— | |||
| 33 | Osisang Chilton | 1:07.30 (33 h1)  | 
— | |||
| DNS | Ariarne TitmusDNS | — (DNS h1)  | 
— | |||
| DNS | Kanako WatanabeDNS | — (DNS h1)  | 
— | 
| Pos | Athlete(s) | Country | Mark | |
|---|---|---|---|---|
| 1 | Simone Manuel | 53.23 | ||
| 2 | Cate Campbell | 53.27 | ||
| 3 | Mallory Comerford | 53.30 | ||
| 4 | Taylor Ruck | 53.34 | ||
| 5 | Shayna Jack | 53.61 | ||
| 6 | Emma McKeon | 53.97 | ||
| =7 | Margo Geer | 54.02 | ||
| =7 | Kayla Sanchez | 54.02 | ||
| 9 | Kelsi Worrell | 54.09 | ||
| =10 | Rikako Ikee | 54.14 | ||
| =10 | Katie McLaughlin | 54.14 | ||
| 12 | Madeline Groves | 54.18 | ||
| 13 | Abbey Weitzeil | 54.20 | ||
| 14 | Allison Schmitt | 54.53 | ||
| 15 | Rebecca Smith | 54.54 | ||
| 16 | Larissa Oliveira | 54.68 | ||
| 17 | Tomomi Aoki | 54.84 | ||
| =18 | Brianna Throssell | 54.93 | ||
| =18 | Alexia Zevnik | 54.93 | ||
| 20 | Chihiro Igarashi | 54.96 | ||
| 21 | Gabby DeLoof | 55.22 | ||
| 22 | Mayuka Yamamoto | 55.32 | ||
| 23 | Kyla Leibel | 55.37 | ||
| 24 | Rio Shirai | 55.44 | ||
| 25 | Sarah Fournier | 55.57 | ||
| 26 | Yui Yamane | 55.73 | ||
| 27 | Lorrane Ferreira | 56.50 | ||
| 28 | Ai Soma | 57.13 | ||
| 29 | Nicole Oliva | 57.17 | ||
| 30 | Miranda Renner | 1:00.05 | ||
| 31 | Mineri Gomez | 1:04.40 | ||
| 32 | Gianna Garcia | 1:04.54 | ||
| 33 | Osisang Chilton | 1:07.30 | ||
| DNS | Ariarne TitmusDNS | — | ||
| DNS | Kanako WatanabeDNS | — | 
| Pos | Athlete(s) | Country | Mark | |
|---|---|---|---|---|
| 1 | Cate Campbell | 52.03 | ||
| 2 | Simone Manuel | 52.66 | ||
| 3 | Taylor Ruck | 52.72 | ||
| 4 | Mallory Comerford | 52.94 | ||
| 5 | Rikako Ikee | 53.14 | ||
| 6 | Kayla Sanchez | 53.68 | ||
| 7 | Shayna Jack | 53.74 | ||
| 8 | Larissa Oliveira | 54.78 | 
| Pos | Athlete(s) | Country | Mark | |
|---|---|---|---|---|
| 1 | Emma McKeon | 53.37 | ||
| 2 | Kelsi Worrell | 54.33 | ||
| 3 | Margo Geer | 54.47 | ||
| 4 | Brianna Throssell | 54.50 | ||
| 5 | Tomomi Aoki | 54.69 | ||
| 6 | Rebecca Smith | 54.72 | ||
| 7 | Chihiro Igarashi | 55.05 | ||
| 8 | Alexia Zevnik | 55.45 |