Tests offer no clues about Andy Murray’s cramp issues

Andy Murray’s cramp issues remain a mystery after tests came back clear ahead of the US Open.

The 35-year-old has generally coped well with hot and humid conditions during his career but has struggled over the past few weeks, cramping in three different matches, including his loss to Cameron Norrie in Cincinnati last week.

Murray underwent sweat testing to try to get to the bottom of the problem but that did not flag up any issues.

Brutal practice in the heat with @andy_murray