Formula One: Lewis Hamilton
I'll be watching Lewis Hamilton's progress at Mercedes like a hawk in 2013.
There's been so much negativity about his switch from McLaren to Michael Schumacher's old team, much of it based on the fact that the great man was unable to do anything with them for the past three years. But I believe Hamilton will make a huge difference on many levels.
"Aerodynamics for sure is the key performance area," the Mercedes team principal, Ross Brawn, acknowledged this year, "and because of that we have done a substantial amount of work to improve the strength and capacity and facilities of our aero group."
Mike Elliott, the former chief aerodynamicist at Lotus who created this year's impressive E20, joined Mercedes AMG as head of aero in July and the new W04 car will be the first to reflect his influence.
There are other big changes afoot and the "retirement" of Norbert Haug as Mercedes' head of motor sport is surely just the start of a reorganisation Niki Lauda is going to effect as the newly appointed "non-executive chairman".
Lewis will be on a mission, not just to drag Mercedes to the front, but to demonstrate that he made a good decision. How well the team gels, and how much progress they can make, will be fascinating to monitor.