The former world No.1 is in striking distance of American leader Brendon Todd halfway through the WGC-FedEx St. Jude Invitational in Tennessee.
The Aussie golfer was sent out on his own for a third round in Connecticut after taking a test for coronavirus mid-tournament. It came back negative.
Brendon Todd carded a career low nine-under 61 to take a two-stroke lead in the third round,capping a day on which Jason Day requested a coronavirus test.
Jason Day is raring to go at next week's US PGA Tour restart,aiming to reboot his own career in the congested schedule ahead.
Plagued by injury and illness in recent years,Jason Day is prepared to test his limits with a marathon schedule of 11 tournaments in 13 weeks when tour golf returns.
US PGA Tour commentator Brandel Chamblee has expressed concern for the chronically injured Jason Day and says he needs to prioritise recovery.
Jason Day and Tiger Woods have both pulled out of lead-in tournaments with back problems.
Day's back injury had prevented him from putting for more than 30 minutes at a time.
Jason Day has credited a realisation not to"get angry"with Riviera Country Club for his lowest round at the Los Angeles course.
Jason Day says he's never been more relaxed as he tries to finally lift the US PGA Tour's Pebble Beach Pro-Am trophy that has eluded him for more than a decade.
Australians Day and Greg Chalmers are keeping pace with the leaders midway through the second round of the US PGA Tour event in California.