Andy Murray launched 2017 as the world No. 1.

After an injury-shortened season, the two-time Wimbledon champion will begin 2018 with a simple aim: regain full fitness. 

Watch: Federer's Australian Adventure

"When I was fit and healthy last year (2016) you think about winning all the major events, getting to No. 1 and winning every competition that you are in and that is what really drives you," Murray told Sky Sports' Jacquie Beltrao. "When you miss four or five months and there has been a bit of uncertainty about my hip or stuff (that changes). I missed the US Open and almost missed Wimbledon as well."

"The goals change and I remember now how much I just loved playing tennis. It isn't about winning every match that I play in the future or winning more Slams."

The 16th-ranked Scot has not played a tour-level match since dropping 12 of the final 14 games in a 3-6, 6-4, 6-7 (4), 6-1, 6-1 Wimbledon quarterfinal loss to Sam Querrey in July.

The lingering hip injury forced Murray to pull out of the US Open 48 hours before the Flushing Meadows major began in August.

It has been a busy offseason for Murray, whose wife, Kim, gave birth to the couple's second child, a daughter, last month. Murray also split with coach Ivan Lendl and spent some time training in Miami.

"I want to get back to playing tennis, I want to be fit and healthy and that is what is driving me just now," Murray told Sky Sports. "I am hoping next year I can get back to that and if I do (get back to being fit and healthy) then I have an opportunity to compete for the biggest tournaments in the world and I still believe that."

Roger Federer, who won two of the four Grand Slam championships to finish 2017 ranked No. 2 behind Rafael Nadal, said he expects greatness from Murray, 12-time Grand Slam champion Novak Djokovic and three-time major champion Stan Wawrinka, who are all aiming to comeback from injuries in 2018.

"Coming back is always a challenge for the body," Federer told the media in London last month. "It's a challenge for the team because you got to be extremely patient yet positive. Not so easy, you know, in some instances.

"I expect obviously from the likes who have been extremely high up in the rankings, who have won slams, like Stan, Andy and Novak, of course I expect greatness from them. When they return at some stage, not maybe from the very beginning. But I wouldn't be surprised if it worked out for them as well like it worked out for me and Rafa."

Photo credit: Mark Peterson/Corleve