IM Chattanooga 2018 was forced to cancel the swim, and the race was started with a time-trial start on the bike. Results are not eligible for course records, otherwise Cody Beals 4:20 would have been a new bike course record. (Matt Russell and Kirill Kotshegarov were also under the still-standing record of 4:27:28 by Marino Vanhoenacker.)
Male Race Results
Cody Beals won his second IM and secured his slot for Kona 2019.
| Rank | Name | Nation | Bike | Run | Time | Prize Money |
| 1 | Cody Beals | CAN | 04:20:25 | 02:48:17 | 07:10:22 | US$ 15,000 |
| 2 | Matthew Russell | USA | 04:23:41 | 02:55:43 | 07:21:55 | US$ 7,500 |
| 3 | Kirill Kotshegarov | EST | 04:22:48 | 02:58:06 | 07:23:06 | US$ 5,000 |
| 4 | Adam Otstot | USA | 04:30:35 | 02:59:51 | 07:32:13 | US$ 3,250 |
| 5 | Scott Defilippis | USA | 04:37:21 | 02:52:14 | 07:32:47 | US$ 2,750 |
| 6 | Adam Feigh | USA | 04:31:50 | 03:11:36 | 07:45:18 | US$ 2,000 |
| 7 | Markus Thomschke | GER | 04:33:41 | 03:11:58 | 07:47:44 | US$ 1,500 |
| 8 | Paul Ambrose | AUS | 04:31:37 | 03:18:27 | 07:52:21 | US$ 1,250 |
| 9 | Colin Laughery | USA | 04:46:18 | 03:12:04 | 08:01:02 | US$ 1,000 |
| 10 | James Lubinski | USA | 04:38:20 | 03:23:41 | 08:04:42 | US$ 750 |
| 11 | Joe Gambles | AUS | 04:35:34 | 03:33:34 | 08:11:07 | |
| 12 | Sebastian Neef | GER | 04:32:12 | 03:38:54 | 08:12:54 | |
| 13 | Daniel Clarke | CAN | 04:47:17 | 03:36:26 | 08:26:00 | |
| 14 | Stephen Kilshaw | CAN | 04:37:33 | 04:12:25 | 08:51:41 | |
| 15 | Peter Kotland | CZE | 05:03:55 | 03:45:56 | 08:54:41 |