This blog post looks at the best runs in 2018 IM-distance races. (Information about the best swims here and the best bike rides here.)
TOP 10 Run Times of 2018
| Rank | Name | Actual Time | Race |
| Matt Hanson | (02:34:39) | IM Texas on 2018-04-28 | |
| Ivan Tutukin | (02:35:19) | IM Texas on 2018-04-28 | |
| 1 | Jan Frodeno | 02:39:06 | IM Germany on 2018-07-08 |
| 2 | Braden Currie | 02:39:59 | IM Cairns on 2018-06-10 |
| 3 | Ivan Tutukin | 02:40:00 | IM Austria on 2018-07-01 |
| Will Clarke | (02:40:43) | IM Texas on 2018-04-28 | |
| 4 | Javier Gomez | 02:41:02 | IM Cairns on 2018-06-10 |
| 5 | Maxim Kuzmin | 02:41:28 | IM Barcelona on 2018-10-07 |
| 6 | Patrick Lange | 02:41:31 | IM Hawaii on 2018-10-13 |
| 7 | Cameron Brown | 02:41:55 | IM New Zealand on 2018-03-03 |
| 8 | Joe Skipper | 02:42:27 | Challenge Roth on 2018-07-01 |
| 9 | Miquel Blanchart Tinto | 02:43:26 | IM Barcelona on 2018-10-07 |
| 10 | Jaroslav Kovacic | 02:43:27 | Challenge Almere on 2018-09-08 |
TOP 10 Run Times of 2018
| Rank | Name | Actual Time | Race |
| 1 | Laura Philipp | 02:52:00 | IM Barcelona on 2018-10-07 |
| 2 | Sarah True | 02:54:58 | IM Germany on 2018-07-08 |
| 3 | Anne Haug | 02:55:20 | IM Hawaii on 2018-10-13 |
| 4 | Beth McKenzie | 02:55:23 | IM Cairns on 2018-06-10 |
| 5 | Corinne Abraham | 02:56:45 | IM France on 2018-06-24 |
| 6 | Daniela Ryf | 02:57:05 | IM Hawaii on 2018-10-13 |
| Melissa Hauschildt | (02:57:07) | IM Texas on 2018-04-28 | |
| 7 | Sarah True | 02:57:38 | IM Hawaii on 2018-10-13 |
| 8 | Linsey Corbin | 02:58:16 | IM South Africa on 2018-04-15 |
| 9 | Sarah Piampiano | 02:58:21 | IM Brasil on 2018-05-27 |
| Lesley Smith | (02:58:47) | IM Texas on 2018-04-28 | |
| 10 | Daniela Ryf | 02:58:53 | IM Germany on 2018-07-08 |
TOP 10 Run Performances of 2018
| Rank | Name | Normalized Time | Actual Time | Race |
| Matt Hanson | (02:37:37) | (02:34:39) | IM Texas on 2018-04-28 | |
| Ivan Tutukin | (02:38:18) | (02:35:19) | IM Texas on 2018-04-28 | |
| 1 | Patrick Lange | 02:38:39 | 02:41:31 | IM Hawaii on 2018-10-13 |
| 2 | Ivan Tutukin | 02:41:43 | 02:40:00 | IM Austria on 2018-07-01 |
| 3 | Diego Van Looy | 02:42:09 | 02:49:18 | IM Wales on 2018-09-09 |
| 4 | Jan Frodeno | 02:42:21 | 02:39:06 | IM Germany on 2018-07-08 |
| 5 | Carlos Aznar Gallego | 02:42:34 | 02:49:26 | Challenge Madrid on 2018-09-23 |
| 6 | Bart Aernouts | 02:42:45 | 02:45:41 | IM Hawaii on 2018-10-13 |
| 7 | Braden Currie | 02:42:51 | 02:39:59 | IM Cairns on 2018-06-10 |
| 8 | Miquel Blanchart Tinto | 02:43:01 | 02:45:35 | IM Lanzarote on 2018-05-26 |
| 9 | David McNamee | 02:43:07 | 02:46:03 | IM Hawaii on 2018-10-13 |
| Will Clarke | (02:43:48) | (02:40:43) | IM Texas on 2018-04-28 | |
| 10 | Timothy Van Houtem | 02:43:55 | 02:50:50 | Challenge Madrid on 2018-09-23 |
TOP 10 Run Performances of 2018
| Rank | Name | Normalized Time | Actual Time | Race |
| 1 | Anne Haug | 02:52:14 | 02:55:20 | IM Hawaii on 2018-10-13 |
| 2 | Daniela Ryf | 02:53:57 | 02:57:05 | IM Hawaii on 2018-10-13 |
| 3 | Sarah True | 02:54:29 | 02:57:38 | IM Hawaii on 2018-10-13 |
| 4 | Lisa Roberts | 02:54:48 | 03:02:11 | Challenge Madrid on 2018-09-23 |
| 5 | Sarah Piampiano | 02:56:15 | 02:59:26 | IM Hawaii on 2018-10-13 |
| 6 | Alexandra Tondeur | 02:56:55 | 03:04:23 | Challenge Madrid on 2018-09-23 |
| 7 | Laura Philipp | 02:56:56 | 02:52:00 | IM Barcelona on 2018-10-07 |
| 8 | Mirinda Carfrae | 02:58:28 | 03:01:41 | IM Hawaii on 2018-10-13 |
| 9 | Beth McKenzie | 02:58:32 | 02:55:23 | IM Cairns on 2018-06-10 |
| 10 | Sarah True | 02:58:33 | 02:54:58 | IM Germany on 2018-07-08 |