The Scot enjoyed a breakthrough season last year when he became the first British male to win a grand slam in 76 years with his success at the US Open.
The world number three was also crowned Olympic champion during an incredible summer and is determined to keep on improving and adding to his title collection.
He said: “The US Open and the Olympics made me extremely motivated.
“It wasn’t a case of, ‘Oh, everything’s done now’. It’s taken a long time to get there and to win those sorts of events.
“I know the feeling when you do win them now and it’s worth all of the work that you put in.”
He added: “I’m just looking for ways to keep improving.”