The president of the Association of Tennis Professionals, Brad Drewett, has died at the age of 54 following a battle with motor neurone disease.
The governing body of men's tennis says it's deeply saddened to announce that Mr Drewett passed away at his home in Sydney.
He had served as ATP Executive Chairman and President since January 2012.
Spanish star Rafael Nadal was among the first to pay tribute to the Australian.
Drewett won two singles titles in the early 1980s and rose to number 34 in the world rankings.
Since becoming ATP chief last year, he was instrumental in gaining increased prize money for players.
He was widely credited in helping to secure a larger share of prize money for the journeymen
of the sport who more often than not fall at the first hurdle of the four Grand Slams.