The US Open champion heads to the O2 Arena having lost matches in Tokyo, Shanghai and Paris in which he held match points.
“I’m aware of how hard it is to finish matches off , it’s not an easy thing to do," said the Scot.
"I’ve played hundreds and hundreds of matches on tour. Sometimes it will go your way, but against Novak [Djokovic] in Shanghai I don’t think I did a lot wrong."
Murray held five match points in that Shanghai Masters final against the Serb before losing to Polish qualifier Jerzy Janowicz in the third round of the Paris Masters.
“I was disappointed with last week. 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," added Murray.
This is the fifth consecutive year the world number three has qualified for the end-of-year finals and he feels in the right frame of mind to succeed in a tournament where he has reached the semis twice.
“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 Murray is Tomas Berdych who also exited early from Paris. Berdych leads their head-to-head record, but Murray defeated the Czech in four sets 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," revealed Murray.
"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 Berdych, Djokovic and Jo-Wilfried Tsonga but feels any group would have been a tough ask.
“Indoors Roger [Federer] has been the best player over the last few years while [Juan Martin] 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," he said.
“Now that it’s done, you have to look at it like a quarter-fnals of a Grand Slam - trying to play it like a knockout event and try and win all your matches if you can."
The ATP World Tour Finals is one of Murray's favourite tournaments as the crowds are full and the early matches immediately test his game.
“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," he added.
The Scot is back with his instrumental coach Ivan Lendl for the first time at a tournament since his triumph at the US Open.
"It’s good, I always enjoy having him around. He’s been a great asset to me and my team," Murray said of the eight-times Grand Slam champion who also won the World Tour Finals five times.
"He’s helped me come back from some tough losses and finish the Slams very well. I hope we can have a good tournament."
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