BOSTON -- From one great rivalry to another.
The Celtics routed the Philadelphia 76ers 120-87 on Friday night to earn a second-round matchup with the Detroit Pistons, the Bad Boys of the 1980s who succeeded Boston as the Eastern Conference's dominant power.
''To feel what some of the old guys were talking about, that we've heard about. To finally be a part of it and to build our own era,'' Celtics captain Antoine Walker said. ''That's what I was celebrating.''
Paul Pierce scored 46 points -- the fifth-best playoff performance in the storied franchise's history -- and Walker had 26 with nine rebounds and six assists as the Celtics beat the defending Eastern Conference champions to win the first-round series 3-2.
Allen Iverson scored 31 as the Sixers tried to become just the seventh team to win a five-game series after losing the first two. But they wilted when the Celtics went on a 19-4 run late in the fourth quarter, igniting the crowd and rekindling memories of the Boston Garden and the 16 NBA titles the Celtics won while playing there.
The Celtics are making their first postseason appearance since 1995, and they had not advanced in the playoffs since 1992, Larry Bird's final season.
''We turned it around,'' said point guard Kenny Anderson, the only player on Boston's roster who was in the league the last time the franchise won a playoff series. ''Celtics pride is back.''
In another Game 5 matchup Friday night, San Antonio routed Seattle 101-78.
Dallas and Sacramento were to play Game 1 of their Western Conference semifinal on Saturday night.
Pierce was 8-for-10 from 3-point range, pushing off Matt Harpring and calmly nailing a 3 to give Boston a 97-79 lead with 6:05 left. The Sixers called a timeout, and the scoreboard cut to crowd shots of Red Auerbach, Tommy Heinsohn, Danny Ainge, Jo Jo White and Cedric Maxwell.
The fans went wild, and the Celtics responded.
Walker followed with a 3-pointer and Pierce hit two more to make it 106-82 with 4:15 left. Boston went 9-for-10 from 3-point range in the fourth quarter and 19-for-29 in all.
Eric Williams hit a basket to make it 108-82 and bring the substitutes in. Walker hit another 3 to give Boston a 30-point lead with 3:11 left.
''To have the game in hand and be able to soak up the atmosphere was a bonus -- a great luxury,'' said Boston's Jim O'Brien, the former Rick Pitino assistant and former Sixers fan who is making his first playoff appearance as a head coach.
''The mandate that we were given when we got here five years ago was to get the FleetCenter to be the Garden again. I think what this series did was accomplish that,'' O'Brien said.
The Boston fans closed it out with a traditional chant of ''Beat LA!'' But the Celtics have another traditional rival to get through first: the Pistons, who knocked Boston out of the playoffs while winning NBA titles in 1989 and '90.
Boston and Philadelphia have one of the oldest rivalries in the NBA, from the 1960s when Wilt Chamberlain was leading the Warriors against Bill Russell, through the Bird and Julius Erving matchups of the '80s.
After Boston won the first two games of this one, the Sixers made it a series worthy of the rivalry by winning two at home. But to advance, they needed to win one game in Boston, where the Celtics went 27-14 in the regular season and have won eight in a row.
The FleetCenter was packed for the most important game in its history, as the last time Boston made the playoffs was in the final year of the Boston Garden. The crowd was juiced -- at one point it taunted Derrick Coleman into clanging a free throw off the front of the rim -- and so were the players.
Pierce could barely control himself before the opening tip, jumping around at the free throw line before any other players joined him on the court. He was among four Celtics starters with no playoff experience before this series.
That was the biggest advantage the Sixers brought into the series, with five holdovers from the team that lost to the Lakers in the NBA Finals last year.
But Iverson, who missed the last 14 games of the regular season with a broken hand and played the series with it padded, couldn't do it himself. Dikembe Mutombo had 12 points but shot 2-for-6 and had just six rebounds, negating the size advantage that was Philadelphia's biggest edge.
''If we'd played our best, I don't think that would have been good enough,'' said Sixers coach Larry Brown, who dismissed rumors that he would not return next season. ''They hadn't been to the playoffs in quite a while. But we met a team that appeared to be more relaxed than ours did.''
Spurs 101, SuperSonics 78
Tim Duncan, back from his father's funeral a day earlier, scored six of San Antonio's first eight points and finished with 23 to lead the Spurs to an emotion-fueled rout of Seattle in the deciding game of their best-of-five series.
With the victory, San Antonio advanced to a second-round matchup with the two-time defending NBA champion Los Angeles Lakers and a chance to avenge last year's four-game sweep by the Lakers in the Western Conference finals.
Malik Rose added 18 points and a game-high 13 rebounds for the Spurs.
Visiting Seattle was held to 10 points in the first quarter and 26 in the half, both record lows for the team in the postseason. They were outrebounded on the night 53-39 and shot 34 percent from the floor.
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