Philadelphia 76ers head coach Doc Rivers labelled Ben Simmons "special" after the Eastern Conference top seeds made a winning start in the NBA playoffs.

Simmons, Tobias Harris and Joel Embiid starred as the 76ers topped the Washington Wizards 125-118 in Game 1 of the first-round series on Sunday.

While Simmons only finished with six points on three-for-nine shooting, the All-Star tallied 15 rebounds and 15 assists at home to the eighth-seeded Wizards in Philadelphia.

Simmons joined Hall of Famer Wilt Chamberlain as the only 76ers players ever with 15 rebounds and 15 assists in a playoff game, earning praise from Rivers.

"I thought he was special," said Rivers. "Whoever he guarded struggled scoring, he created so many points for us, off the glass to three, off transition to three, creating switches that they didn’t want to have.

"He is just a treasure. He is something that you don't see a lot in this league and he has such a skill set that's so different. There's a lot of people that can't make what of him.

"All I see is his greatness and I just want him to keep doing what he's doing."

Simmons – as the 76ers eye their first championship since 1983 – added: "I just try to make winning plays and do what I can to help this team and be the point guard and run the team.

"Put guys in the right positions, run the right sets, if somebody’s feeling it, keep giving them the ball. I think overall today we did a good job of that."

Harris and MVP hopeful Embiid also flexed their muscles in front of a capped but vocal crowd at Wells Fargo Center.

A playoff career-high 37 points from Harris set the tone, while Embiid had 30 points, six rebounds and three assists.

Harris and Embiid became the first pair of 76ers to score 30-plus points in a playoff game in 31 years since Charles Barkley and Hersey Hawkins.

"Tobias, I have full faith in," Rivers said. "I said it early, I think he struggled the first couple of games, and just from the body of work, coaching them with the Clippers and knowing him and watching him what we are trying to do with him in the training camp, I just really believe it would take over at some point and it has."

Harris is bracing for a challenging playoff campaign, starting with Russel Westbrook, Bradley Beal and the in-form Wizards.

"Yesterday [Saturday] I was watching NBA games, and I was kind of surprised. I said, 'Man, all these games are really close.' It wasn't like a real big spread in any of them," Harris said. "And I think this whole playoffs, game in and game out, you're gonna see dogfights from all around the league.

"I mean, Washington, you know they've been one of the hottest teams after the All-Star break in the whole NBA, so for us, we know the power that they have and the guys that can make shots on the team. So that just adds to our focus as a group and knowing how locked in we need to be for this whole series, and that's only going to help us into where we're trying to go."

The 76ers, who were swept by the Boston Celtics in last season's first round, are dreaming big as they look to progress beyond the Conference semi-finals for the first time since 2001.

"You know we've been there," Embiid said. "And we also have a goal, and to get to that goal, we got to get through these guys. So you know, the mindset is just me, it doesn't matter if it's a week or two weeks off, it doesn't matter if we haven't played in a while. That should not be an excuse."