I'm still a beginner, but this is what I did in my only sprint win... a few weeks ago. (not a real race but none the less)
I picked the guy I wanted to beat and stayed with him... he broke away from the pack by about 5 meters with more than 2km to go and I followed. There was a strong head wind and if I lost him it was all over.... I was sometimes behind him, sometimes just to his right... as he picked up speed, I'd copy... I'd watch his gears and try and stay as relaxed as possible.... when he'd start to wind up, I'd follow....He's look over his shoulder and see me still there and he'd go a bit faster.. As I saw him reach what I thought was his max, I still had some extra power and tried to sling shot past him..... he got the fright of his life when I was accelerating past him at his peak.... made him give up..... I easily beat him.... I still figured I could go faster if he made another attack. (was doing 54kph) against a strong wind. I find it hard to go that fast down hills usually... I was drafting him to perfection...the wind was obviously killing him.
This guy is a friend and a B grade rider..where as I'm only still in E class. I'm too heavy to lead, and he had no idea how close I was or how easy I was going. most of the time.... I just timed it well and kept my cool.
Luckily those others in our race (training race) were also E class.
Later that night I uploaded my HRM and my heart had peaked at 192. It had never gone over 191 before...so even though I was relaxed and focused on keeping the lead....my heart was peaking at the right time... not before the sprint but just before the finish line.... I had no idea it was going so hard....
Staying cool and in good position is about the best I can think of....
Baden Cooke seems to be doing the same, and I think we'll see him win a lot more sprints this year.... watch him... you can see him thinking in the last 200m... looking everywhwhere...he is really aware of what everybody else is doing....
I'm always pretending that I'm, attached to the leaders by a big elastic band and that as they speed up, my potential energy is building and when the elastic is fully stretched I let it go and see if I can just fly by..... don't let the elastic snap before you break....