Duncan's race career in photos, spanning three continents and dozens of meetings - share the highs and lows here.
A wet day in March, and Duncan is preparing for a winning season.
The opening weekend of the season, on March 31st and April 1st, saw Duncan finish runner-up in race one and win the second contest.
A double victory on April 21-22 made it three wins from four to start the season with.
At Thruxton on May 5th and 6th Duncan scored a pair of podiums to maintain his title charge.
The weekend of June 2-3 saw Duncan take a third and a fourth place at Croft.
A fifth place in the first race, on June 23, would prove to be Duncan's worst finish of the year - but he followed it up with a podium the next day.
A third and a fourth place for Duncan on the weekend of July 14-15 as he maintained his record of at least one podium at each event.
Back to winning ways with style on the weekend of July 28-29 as Duncan won both Snetterton races.
Duncan crossed the line first in both Brands races during the weekend of August 18-19, but an inadvertent technical infringement saw his car ruled illegal and the second win was stripped from him.
With the season coming to a climax the weekend of September 8-9 saw another clean sweep for Duncan, taking victory in both races at Donington.
Duncan delivered the championship with a win and a third place in the season's final weekend, October 13-14.