Great Britain's Andy Murray has insisted that he has not taken his eye off the ball following his success at the recent US Open.

The 25-year-old lost in the semi-final of the Japan Open last week to Milos Roanic, prompting some pundits to suggest that he was suffering with a come down after winning his first Grand Slam title.

However, Murray is adamant that he is fully focused on ending 2012 on a high note.

"I tried very very hard last week, I played some tough matches. I haven't had perfect preparation because I took a lot of time off after the US Open," he told BBC Sport.

"I am very motivated to finish well this year. I didn't finish last year how I would have liked. I want to make sure I'm fully fit for it I'm looking forward to it."

Murray is currently competing at the Shanghai Masters.