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Andy Murray believes the only thing that will force him into retirement is if the former British No 1 no longer sees any improvement in his game. But for now, Murray insists he is still gradually getting better and better as he seeks to climb the tennis rankings.

The 35-year-old has struggled for consistency since undergoing two major hip operations. Niggling injuries have forced him to sit out of a couple of Grand Slams over the past few years.

Murray crashed out of the second round at Wimbledon in June, losing to John Isner in four sets. He got the better of James Duckworth in another four-setter in the previous round.

And after another defeat by Alexander Bublik in the Hall of Fame Open, Murray reiterated his desire to continue playing. The World No 52 insists he will quit once he no longer sees any improvement in his performances.

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