Ussher cites last year's runner-up Dougal Allan, last year's two-day winner James
Coubrough and Australian-based Kiwi Braden Currie as his main competition.
Coubrough is a good runner and paddler and Currie is an aggressive athlete who has the ability to pull out something special on the day.
Ussher's win in 10hr 41min 12sec last year was the second-fastest in the event's history.
But Ussher said there were quite a few aspects of that performance he was unhappy with, and he'd been rusty not having done the race the two previous years.
"Especially the run and the kayak were, I felt not great, and I've been doing work on this,'' he said.
If that's bad news for his rivals, the good news is there's a tiny hint this might be his last one-dayer.
"Never say never, and definitely things change every year, but we are starting to look to the future a bit.''
However, he was sure he'd be there "in some capacity'' in future.
After the Coast to Coast, Ussher has the Queenstown Godzone Adventure in April and the Xterra world championship in Maui in October on his schedule.
The Queenstown event is the first unsupported expedition race in New Zealand for a long time. Ussher is competing in a four-person team with his wife, Currie, and teenager Sam Clark.