Andy Murray has admitted his on-court behaviour needs to improve after he was branded "miserable" by former British number one Tim Henman.

Henman recently said Murray's behaviour needs to improve if he wants to win Wimbledon and it is a weakness the 21-year-old admits he is working on.

"Sometimes I'm immature on court and that's not acceptable," said Murray.

"It needs to get better. This year it's definitely been much better than the last four or five months of last year."

He added: "I personally think that off the court I'm pretty happy and don't get too down about things.

"But on the court I could be more bubbly, if that's what everybody thinks.

606: DEBATE Your thoughts on Andy Murray

Next up for Murray is the French Open at Roland Garros, which begins on Sunday.

His only previous appearance at the tournament saw him knocked out in the first round, but he is seeded 11th for the second grand slam of the year.

That ranking will see him avoid the likes of world number one Roger Federer and clay court king Rafael Nadal in the opening rounds and Murray is focused on making it through to at the least the second week of the tournament.

"Hopefully this year I'll get through a couple of rounds. I played well over the last few weeks on clay, certainly better than I have done in previous years," Murray added.

"The clay at Roland Garros is a little bit quicker than on other courts and that should help me.

"Hopefully I can get through a couple of rounds. Getting through to the second week would be a great result."

A disappointing start to this year saw the British number one and world number 11 knocked out of the Australian Open in the first round by Jo-Wilfried Tsonga.

That followed a frustrating period that saw Murray sit out last year's French Open and Wimbledon through injury and now he is focused on winning his first grand slam.

I want to improve in the grand slams and get better Andy Murray

He said: "I missed a couple of Grand Slams last year. The Australian Open wasn't great for me but I did lose to the eventual finalist.

"In the slams I played before my wrist injury I was starting to get better. I want to improve in the grand slams and get better.

"The French Open is probably not the one that I'm going to win first.

"I have a better chance at Wimbledon or the US Open, but I'm still looking forward to the French Open that's for sure."