Andy Murray on Tuesday pulled out of his first-round match at the ATP Cincinnati Open with the injured Scot replaced in the draw by Germany’s Daniel Altmaier.
Murray had been in doubt since last week in Toronto, when he handed in a third-round walkover to eventual tournament champion Jannik Sinner.
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The three-time Grand Slam winner was suffering with an abdominal injury and now has less than a fortnight if he is to pull up fit for the US Open starting on 28 August.
Altmaier faces Australian Alexei Popyrin in the first round.