But, as Luis Leon Sanchez tried to take a flier from distance, Bevin struck, coming around the outside of the favourites, catching them unaware, and then showing phenomenal strength to outsprint Ewan to the line.
Bevin said the nature of the finishing straight played into his hands.
"I think on a finish like that I can play my cards pretty well. I haven't come here and hid any form, I was out there yesterday taking time bonuses.
"I don't think saying 'Hey, I'm going to win stage two' was ever on the cards, but with the hard, draggy finish, I got to pick a pretty good line and once Sanchez was off the front in the final it gave me a perfect springboard and I just went long and put my head down."
Bevin now launches into the lead of the race, after yesterday taking five bonus seconds in the breakaway, holding a five second lead over Viviani, and a 15 second advantage over his main rivals for the overall title.
While there are some tough climbs to come, they are all fairly short, punchy efforts - similar to climbs where Bevin has shown the ability to stick with the leaders in the past, and his 15 second buffer could prove extremely handy as the race progresses.
And, if he can't keep the pace, New Zealand could still have a shot at a top result via George Bennett, who avoided the sprinting chaos to finish 17th on the stage, to sit 23rd overall, 15 seconds behind Bevin.
Bevin, who also won the New Zealand national time trial championship earlier this month, has some big goals for 2019, which will include a trip to the Tour de France and a shot at the world time trial championships - if all goes to plan.
So far, it's fair to say everything is going perfectly to plan for the new star of New Zealand cycling.