Saturday opened the door. Sunday blows it off the hinges. The second day of the 2026 NBA Playoffs gives us the other four Game 1s — including a rivalry renewed in Boston, the defending champion Thunder opening at home against a Suns team that barely survived the play-in, an 8-seed Magic squad walking into the league's best defense in Detroit, and Victor Wembanyama making his long-awaited playoff debut in San Antonio.

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Philadelphia 76ers (7) at Boston Celtics (2) | 1:00pm ET, ABC

For the 24th time in NBA history and the sixth time this century, the Boston Celtics and Philadelphia 76ers meet in the playoffs. At this point the series deserves its own recurring calendar event, and this edition comes loaded with more than the usual amount of drama — because both teams enter Sunday in dramatically different shape than anyone projected back in October.

The Celtics exceeded all expectations this season. Despite losing several key players in the offseason and not having Jayson Tatum for the first 62 games as he recovered from an Achilles injury, Boston earned the No. 2 seed in the Eastern Conference. Jaylen Brown played at an MVP level all season. Tatum's return has been the story of the second half — and with him back in the lineup and looking like his superstar self, the Celtics have a clear path to the East semifinals for the fifth straight year.

Philadelphia's story runs in the opposite direction. A combination of injuries, a health scare, and a suspension dramatically impacted the 76ers' fall from contender to play-in team. The biggest variable is Joel Embiid, whose status for this series remains unknown. He required an emergency appendectomy hours before a game on April 9, and no timetable for his return has been given — Embiid was on the bench in street clothes for Philadelphia's play-in win over the Magic. Without him, the burden falls on Tyrese Maxey and Paul George to keep games close long enough to steal one or two in Philly.

Rookie V.J. Edgecombe had 34 points in the Sixers' win in Boston on opening night, and he's capable of catching fire on the playoff stage. But the Celtics' top-five defense, elite execution on both ends, and the slowest pace in the league present a structural problem for a Philly team that relies on Embiid to anchor everything inside. The Sixers owned the best clutch-time defense in the NBA this season, and both of their regular-season wins against Boston came in clutch-time games decided by one or two points — but in both of those games, Tatum wasn't playing.

Philadelphia wins if Maxey plays like the All-Star he is for 48 minutes every night and the Sixers' clutch-time magic translates to a series with actual stakes. A healthy Embiid changes the entire calculus — if he's available at any point, this becomes a real series.

Boston wins if the Jays are themselves, which at this point is a reasonable expectation. The Celtics are heavy favorites and have opened as 10.5-point favorites for Game 1, and the gap between a Tatum-Brown Celtics team playing at full strength and a Sixers team without Embiid is substantial. Philadelphia hasn't won a playoff series against Boston since 1982. Sunday won't be the day that streak ends.

Phoenix Suns (8) at Oklahoma City Thunder (1) | 3:30pm ET, ABC

This 1-8 first-round matchup was the last series to be settled, with Phoenix beating Golden State to regain a playoff berth and earning the toughest task facing any qualifying team: somehow win four times against the defending champions, who are driven to be the first repeat Larry O'Brien winners since the 2017 and 2018 Warriors.

Oklahoma City finished No. 1 in the NBA in adjusted net rating (+10.8) for the second consecutive year, and ranked first in adjusted defensive rating as well. Shai Gilgeous-Alexander is the engine of all of it — he averaged 30.0 points and 7.3 assists against Phoenix this season while shooting 50.9% from the field and 50% from three. The depth around him is the part that makes OKC genuinely scary: Chet Holmgren, Luguentz Dort, Isaiah Hartenstein, Alex Caruso, and Cason Wallace form one of the most versatile defensive rotations in the league.

Phoenix's path to making this competitive runs through Devin Booker and Jalen Green. Green poured in 36 points on 14-for-20 shooting in the Suns' play-in win over Golden State, and Phoenix scored 30 points off turnovers in that game. That kind of performance — active, attacking, making the opponent pay for mistakes — is their best version. The problem is that Phoenix's underbelly was soft against teams shooting inside the arc, ranking 19th in that category, and OKC will get plenty of clean looks inside against a Suns defense that isn't built to slow down the Thunder's ball-movement machine. Phoenix has also looked miserable in halfcourt settings to end the year, which is exactly the environment OKC will try to create.

Phoenix did get two wins against OKC this season, and the Suns have enough three-point volume to catch fire in any individual game. But catching fire once is very different from winning a playoff series.

Phoenix wins if Jalen Green plays like the most explosive scorer on either roster and the Suns' turnover-forcing defense creates enough chaos to disrupt OKC's rhythm. Phoenix leads the NBA in forcing turnovers at 16.3 per game for opponents — if they can rattle the Thunder into sloppy possession after sloppy possession, the math at least gets interesting.

Oklahoma City wins if SGA plays like the league's best player, which is basically a given. The Thunder are -3000 series favorites — that number tells you everything you need to know about how the basketball world sees this matchup. OKC is trying to make history. Phoenix is trying to survive.

Orlando Magic (8) at Detroit Pistons (1) | 6:30pm ET, NBC

Before the 2025-26 season began, the Detroit Pistons and Orlando Magic were thought by many to be on the same tier of the Eastern Conference. If they were to meet in the playoffs, it would probably be in the 4-5 or 3-6 series. Instead, it's 1 vs. 8. Detroit surpassed every projection, going 60-22 to claim the top seed. Orlando spent the second half of the season in survival mode, needing two play-in games just to secure a first-round date with the team that's been the East's best all year.

Cade Cunningham has shaken off the rust after missing 12 games with a collapsed lung and enters the postseason as the most complete two-way guard in this series. The Pistons' identity is built around physicality and interior dominance — they outscored opponents by 13.9 points per game in the restricted area, the third biggest differential for any team in the last 15 seasons. Orlando will have to answer for that every night.

Paolo Banchero, Franz Wagner, and Desmond Bane all average over 20 points per game for the Magic, which is a legitimate offensive trio. Banchero in particular has shown he can score against Detroit — he averaged 26.3 points in three games against the Pistons this season with a 64.8% true shooting percentage. The problem is that the rest of Orlando's offense can't keep pace. The Magic's bench unit finished the regular season ranked 26th in scoring, and there isn't enough shooting outside of Bane to truly stress-test Detroit's defense.

Neither franchise has won a playoff series in more than 15 years, and that streak ends tonight. One of these teams is going to feel that weight lift on Sunday.

Orlando wins if Banchero goes nuclear in Game 1 and the Magic carry their play-in momentum into Little Caesars Arena. Orlando is already in playoff mode — the Magic are coming off a couple of intense play-in games this week while Detroit has been sitting and waiting. That rhythm difference is real, even if the talent gap isn't close.

Detroit wins if Cunningham plays like the star he's become and Jalen Duren punishes the Magic's frontcourt in the paint. The Pistons have too much defense, too much organization on offense, and home-court advantage — and Cunningham should be the best player on the floor in this series by a significant margin. Detroit's been waiting two decades for a moment like this.

Portland Trail Blazers (7) at San Antonio Spurs (2) | 9:00pm ET, NBC

Victor Wembanyama is playing in the NBA playoffs for the first time. Everything else about this series is secondary to that sentence, and anyone who tells you otherwise is lying.

In his third season, Wembanyama averaged 25 points, 11.5 rebounds, 3.1 blocks, and 1.0 steals while shooting 51.2% from the field. He finished as an MVP candidate. He's the favorite for Defensive Player of the Year. And the Spurs are elite with him on the court — scoring 120.5 points and allowing just 103.6 per 100 possessions for a net rating of +17. Without him: essentially replacement level. He's not just a player on this team. He is this team.

The intriguing wrinkle is that Wembanyama missed all three regular-season games against Portland due to various injuries, so the Blazers have had a full season to game-plan for the idea of him without ever actually facing him. He's also dealing with a lingering rib contusion and acknowledged he's not at 100% — which is the kind of crack Portland's coaching staff will absolutely try to exploit. Acting head coach Tiago Splitter faces his former championship team in a matchup that has as many compelling subplots as any series this weekend.

Portland is not here to lay down. Deni Avdija had 41 points — including the go-ahead three-point play with 16 seconds left — in the Blazers' comeback play-in win over Phoenix. He averaged career highs in points (24.2), assists (6.7), and free-throw percentage (80.2%) this season, and his combination of size and playmaking gives Portland a genuine go-to option. Portland ranked fourth in offensive rebound percentage and led all teams in second-chance points per 100 possessions — they grind, they battle on the glass, and they make you earn every stop. Against a Wembanyama who might not be at full strength, those extra possessions matter.

Portland wins if Avdija is the best player on the floor in individual games and the Blazers' transition offense and second-chance points keep San Antonio from dictating tempo. In their lone win against the Spurs on January 3, Portland made 19 threes — that kind of outside shooting performance is what an upset looks like, on paper.

San Antonio wins if Wembanyama is everything everyone knows he is and the Spurs' depth — seven players averaging double figures including De'Aaron Fox at 18.6 and Stephon Castle at 16.7 — wears Portland down over the course of a series. San Antonio's been waiting six years to play meaningful May basketball. This is what they built for.

The other four games. Forty-eight minutes each. And none of it means a thing yet.

Yesterday gave us Saturday basketball. Today gives us Sunday basketball. By Monday morning, we'll have eight teams who have the initial upper hand. And some of these matchups will have a very brief duration whereas some could go the full way.

What we saw across all eight Game 1s this weekend will set the tone for how the next month unfolds. A team that steals Game 1 on the road doesn't just get a 1-0 lead — it gets a psychological edge that can take an entire series to shake. A team that loses Game 1 at home doesn't just fall behind — it has to recalibrate, answer to its crowd in Game 2, and prove that the opener was an aberration rather than a statement.

None of that happens without the work. Sixteen wins is a number that sounds clean in the abstract. In practice, it's a grind played out one 48-minute segment at a time, against opponents who have also been waiting all year for this. The teams that last are the ones that understand that — that the next game is always the only one that matters.

Four teams will gain that upper hand today.