The US Open champion comes to London having been beaten in his last three tournaments despite holding match points - including several to win the Shanghai Masters against Novak Djokovic - but he is not worried that he is losing the ability to close matches out.
"I'm aware of how hard it is to finish matches off , it's not an easy thing to do," he said.
"I've played hundreds and hundreds of matches on tour, sometimes it will go your way, but against Novak (losing five match points) in Shanghai I don't think I did a lot wrong.
"I was disappointed with last week (losing at the Paris Masters to Polish qualifier Jerzy Janowicz), I didn't feel I focused as hard as I needed to when I was serving for the match but I'll make sure this week I'll play every point at a time, fight for every point. And I definitely need to do a better job of that."
This is the fifth consecutive year Murray has qualified for the end of year finals and the world number three feels in the right frame of mind to succeed at an event in which he has never made the final and only twice made the semis.
"There's always pressure at the big tournaments but I feel a bit more relaxed coming in this year because I managed to win the US Open," he said.
"The only thing I can guarantee is that I'll give 110 per cent on the court, try my hardest in all of the matches and see where that gets me."
First up for the Scot is Thomas Berdych, who also lost in the early rounds in Paris, and Murray is happy to be facing a player he defeated in four sets back in the semi-finals at Flushing Meadows.
"I knew my first match was going to be against Berdych or Del Potro so they are both big guys, big hitters of the ball and hitting winners from all areas of the court so I'll try and use some variety," he said.
"Against all the guys here you're going to have to play a top quality match to win but you'll have to make slight adjustments to your tactics for all of them."
Murray faces a tough group alongside Novak Djokovic, Jo Wilfried Tsonga and Berdych but feels any group would have been a tough ask.
"Indoors, Roger (Federer) has been the best player over the last few years, Del Potro won two tournaments indoors just before Paris. It depends; if everyone plays their best tennis then I don't think one group can be tougher than the other.
"Now that (the draw) is done, you have to look at it like a quarter-finals of a Grand Slam, trying to play it like a knockout event and try and win all your matches if you can.
"I'm always motivated when I play the best players in the world. If you're playing at the top of any sport you want to compete against the best guys and that's the best marker of where your game is at.
"I've always enjoyed that challenge."
The Scot hopes to have a trump card with him for the event: he has coach Ivan Lendl with him at a tournament for the first time since his triumph at the US Open.
"It's good, I always enjoy having him around," Murray said.
"He's been a great asset to me and my team. He's helped me come back from some tough losses and finish the slams very well , which was nice. I hope we can have a good tournament."