"We have just had an amazing summer of tennis and delivered the most successful Australian Open in history," Healy said in a Tennis Australia statement.
"We have achieved a lot during the last eight years and it is the perfect time for me to hand over the reins and pursue other challenges."
Vice president Freeman will take over as interim chairman until October, when a new chairman will be elected at the Tennis Australia annual general meeting.
(Reporting by Aditi Prakash in Bengaluru)
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