American James Blake has withdrawn from the Australian Open due personal reasons, according to a tournament organiser.
The former world number four has also pulled out of the Brisbane International, which starts in early January.
"Just got word that James Blake has withdrawn from the [Australian Open] and Brisbane. Sorry to hear this and we wish James all the best," tournament director Craig Tiley wrote on Twitter.
The Aussie Open, which is 2012's first Grand Slam, begins on Monday, January 16.