Brad Drewett, the head of men’s tennis, is to step down from his post after being diagnosed with motor neurone disease, an incurable condition that damages the nervous system. Drewett, who was appointed executive chairman and president of the Association of Tennis Professionals at the end of 2011, will continue in his role until a successor is found.

A former player who reached a career-high world ranking of No 34, Drewett has proved a hugely popular appointment with both the players and the tournaments. In particular the 54-year-old Australian has played a major role in persuading Grand Slam tournaments to increase prize money.

Andy Murray said he was shocked by the news. “He’s done a very good job for the tour,” Murray added. “He's done a good job of bringing the tournaments together and arranging the meetings we had with the Slams. He's definitely had an impact in the time he's been working there.”