Carlos Bernardes suffered a heart attack in quarantine ahead of the Australian Open, local media reports.
An image of the veteran Brazilian chair umpire being wheeled into an ambulance was posted by Tennis News Brasil.
Tiley on Adelaide Bubble: Nature of the Business
The website reports Bernardes was taken to a Melbourne hospital and is "okay" and recovering.
The gold badge chair umpire officiated the 2006 and 2008 US Open men's finals as well as the 2011 Wimbledon men's championship match.
Bernardes was serving a 14-day quarantine in his Melbourne hotel room after three AO charter flights featured cases of COVID-19, which prompted government officials to put all passengers on those flights into a hard quarantine.
The Australian Open is scheduled for February 8-21st. AO CEO Craig Tiley announced the tournament will proceed as scheduled.
Photo credit: Charlie Cowins - Flickr/Wikimedia Commons