Back and forth it has gone, so Rivers understands that having the chance to put the Sixers away in Wednesday's Game 6 at the Wells Fargo Center will be a daunting task.
"It's not going to be easy," Rivers said when asked what the Celtics needed to do to close the series. "Listen, this series is hard."
This isn't just coach-speak. The Celtics at times have had trouble keeping pace with the Sixers.
"They're a good team, they're an athletic team," Rivers said. "Every minute you think, like we're leaking oil physically."
The oil comes from some creaky but crafty players, specifically Kevin Garnett, Paul Pierce, and Ray Allen, who among them have appeared in 356 playoff games.
Pierce insists a sprained knee that he suffered in the first round against Atlanta isn't an issue. He is averaging more than 38 minutes per game against the Sixers, but still, even when healthy, he isn't always the fleetest of foot.
Allen has been hampered by an ankle problem that has clearly affected his play.
As for Garnett, his only malady appears to be old age. Yet in this series and in the playoffs in general, he's certainly not acting his age.
Garnett turned 36 on May 19, but he's much older in NBA years, having joined the league right out of high school. This is his 17th season and his minutes are somewhat monitored, but Garnett and Celtics point guard Rajon Rondo have been the Sixers' biggest headaches.
Both are averaging double-doubles against the Sixers. Rondo is averaging 14.4 points and 14.6 assists. Garnett is averaging 20 points and 10.6 rebounds.
Rivers admitted that the team was looking to feed Garnett in the post in Game 5, and who can question that strategy.
Even though he missed some open shots in Game 5 that he had been knocking down this series, Garnett still shot 8 for 17 in scoring 20 points.
The shooting statistic is significant since the Celtics are 1-3 during their two playoff series when Garnett attempts 12 or fewer shots, and 6-1 when he takes 13 or more.
The Celtics feed off Garnett's toughness and he fears neither the 76ers, nor apparently, their fans. Garnett is sure to get an interesting greeting Wednesday after responding this way to a question asking him to compare Philadelphia fans to Boston fans.
"Not even close, not even close," Garnett said. "You got fans and then you got fair-weather fans. Take it how you want it."
Put it this way: He wasn't referring to Boston's fandom as fair-weather.
So Sixers fans likely will be on Garnett, but more importantly, can the Sixers guard him well enough to force one final trip on Saturday to Boston?
Contact Marc Narducci at 856-779-3225, firstname.lastname@example.org or @sjnard on Twitter.