Rivers all-time record is 945-641 (.581).
Don Nelson leads the list wit 1,335 career wins, followed by Lenny Wilkins and Gregg Popovich with 1,332 and 1,273 respectively.
Rivers, who also coached the Celtics from 2004 to 2013 and Clippers until last season, led Boston to their last title in 2008, having players like Paul Pierce, Kevin Garnett, Ray Allen and Rajon Rondo in the roster.
''I remember growing up in Cleveland Lenny Wilkins setting the all-time win records,'' Sixers president of basketball operations Daryl Morey said. ''I think coach Doc Rivers has a chance to pass him in Philly.''