Philadelphia hosts Thursday's 8 p.m. ET first-round game at Xfinity Mobile Arena, with Boston favoured by 5.5 points after the 76ers' 113-97 Game 5 win.
A Celtics victory would clinch the series and send Boston into the second round against either the Atlanta Hawks or New York Knicks.
Philadelphia trails 3-2 after extending the series in Game 5, while a deciding Game 7 is scheduled for Saturday in Boston if needed.
After a historic fourth-quarter collapse, can Boston's star duo be trusted to close out the series in Philadelphia?
With both stars back from major injuries, whose health is the bigger gamble in this do-or-die Game 6?
Is NBC's NBA ratings boom a sustainable media revival, or just a short-lived nostalgia trip for fans?