Schedule and 2025-26 Results
Regular Season Records: Boston 56-26, Philadelphia 45-37
Game 1 on Sunday, 19 April: Philadelphia loses at Boston, 123-pts-91
Game 2 on Tuesday, 21 April: Philadelphia wins at Boston, 111-pts-97
Game 3 on Friday, 24 April: Boston wins at Philadelphia, 108-pts-100
Game 4 on Sunday, 26 April: Boston wins at Philadelphia, 128-pts-96
Game 5 on Tuesday, 28 April: Philadelphia at Boston
Game 6* on Thursday, 30 April: Boston at Philadelphia
Game 7* on Saturday, 02 May: Philadelphia at Boston
* if needed

HISTORICAL VICTORY PROBABILITIES: Leading 3-games-1:
Ignoring win order; ignoring site order: The team leading 3-games-1 irrespective of site order (Boston) has the following best-of-7 playoff series and games record through the 2025 MLB Finals:
series record, all best-of-7 sports, all rounds: 691-59 (.921)
series record, all best-of-7 sports, Preliminary round: 206-26 (.888)
series record, NBA only, all rounds: 285-13 (.956)
series record, NBA only, Preliminary round: 87-3 (.967)
Game 5 record, all best-of-7 sports, all rounds: 425-325 (.567)
Game 5 record, all best-of-7 sports, Preliminary round: 125-107 (.539)
Game 5 record, NBA only, all rounds: 179-119 (.601)
Game 5 record, NBA only, Preliminary round: 56-34 (.622)
These records are drawn from the applicable 1616 best-of-7 NHL, NBA, and MLB series played through the 2025 MLB Finals. Note in general that the greater the number of games or series fitting a particular situation, the greater the significance of the corresponding winning fraction: For example, 0.800 is far more likely to come closer to the true winning fraction in a given situation when the corresponding win-loss record is 400-100 rather than 4-1.

HISTORICAL VICTORY PROBABILITIES: Leading 3-games-1 @ HHVV:
Ignoring win order; considering site order: The team leading 3-games-1 with site order HHVV (Boston) has the following best-of-7 playoff series and games record through the 2025 MLB Finals:
series record, all best-of-7 sports, all rounds: 443-27 (.943)
series record, all best-of-7 sports, Preliminary round: 143-12 (.923)
series record, NBA only, all rounds: 188-3 (.984)
series record, NBA only, Preliminary round: 62-0 (1.000)
Game 5 record, all best-of-7 sports, all rounds: 307-163 (.653)
Game 5 record, all best-of-7 sports, Preliminary round: 100-55 (.645)
Game 5 record, NBA only, all rounds: 143-48 (.749)
Game 5 record, NBA only, Preliminary round: 50-12 (.806)
These records are drawn from the applicable 1616 best-of-7 NHL, NBA, and MLB series played through the 2025 MLB Finals. Note in general that the greater the number of games or series fitting a particular situation, the greater the significance of the corresponding winning fraction: For example, 0.800 is far more likely to come closer to the true winning fraction in a given situation when the corresponding win-loss record is 400-100 rather than 4-1.

HISTORICAL VICTORY PROBABILITIES: Leading WLWW:
Considering win order; ignoring site order: The team leading WLWW irrespective of site order (Boston) has the following best-of-7 playoff series and games record through the 2025 MLB Finals:
series record, all best-of-7 sports, all rounds: 176-26 (.871)
series record, all best-of-7 sports, Preliminary round: 53-12 (.815)
series record, NBA only, all rounds: 71-7 (.910)
series record, NBA only, Preliminary round: 21-1 (.955)
Game 5 record, all best-of-7 sports, all rounds: 97-105 (.480)
Game 5 record, all best-of-7 sports, Preliminary round: 25-40 (.385)
Game 5 record, NBA only, all rounds: 36-42 (.462)
Game 5 record, NBA only, Preliminary round: 10-12 (.455)
These records are drawn from the applicable 1616 best-of-7 NHL, NBA, and MLB series played through the 2025 MLB Finals. Note in general that the greater the number of games or series fitting a particular situation, the greater the significance of the corresponding winning fraction: For example, 0.800 is far more likely to come closer to the true winning fraction in a given situation when the corresponding win-loss record is 400-100 rather than 4-1.

HISTORICAL VICTORY PROBABILITIES: Leading WLWW @ HHVV:
Considering win order; considering site order: The team leading WLWW with site order HHVV (Boston) has the following best-of-7 playoff series and games record through the 2025 MLB Finals:
series record, all best-of-7 sports, all rounds: 85-8 (.914)
series record, all best-of-7 sports, Preliminary round: 28-3 (.903)
series record, NBA only, all rounds: 29-1 (.967)
series record, NBA only, Preliminary round: 7-0 (1.000)
Game 5 record, all best-of-7 sports, all rounds: 57-36 (.613)
Game 5 record, all best-of-7 sports, Preliminary round: 16-15 (.516)
Game 5 record, NBA only, all rounds: 22-8 (.733)
Game 5 record, NBA only, Preliminary round: 5-2 (.714)
These records are drawn from the applicable 1616 best-of-7 NHL, NBA, and MLB series played through the 2025 MLB Finals. Note in general that the greater the number of games or series fitting a particular situation, the greater the significance of the corresponding winning fraction: For example, 0.800 is far more likely to come closer to the true winning fraction in a given situation when the corresponding win-loss record is 400-100 rather than 4-1.

SERIES NOTES:

After Game 4: The Boston Celtics visited and bested the Philadelphia 76ers 128-pts-96 to take a best-of-7 MLB/NBA/NHL playoff series 1633 lead of 3-games-1. When leading a best-of-7 MLB/NBA/NHL playoff series 3-games-1, the Boston Celtics have a series record of 32-0 and a Game 5 record of 21-11. When trailing a best-of-7 MLB/NBA/NHL playoff series 3-games-1, the Philadelphia 76ers have a series record of 0-16 and a Game 5 record of 6-10. Leading the Philadelphia 76ers 3-games-1 in a best-of-7 NBA playoff series, the Boston Celtics have a 4-0 series record and a 4-0 Game 5 record against the 76ers. The series 1633 Game 4 victory margin of 32 points is the fourth-largest victory margin by a road team in a best-of-7 NBA playoff series to increase a 2-games-1 series lead to 3-games-1; in the previous three cases, the road team achieving the lopsided Game 4 victory then won Game 5 and the series.

After Game 3: The Boston Celtics visited and outscored the Philadelphia 76ers 108-pts-100 to take a best-of-7 MLB/NBA/NHL playoff series 1633 lead of 2-games-1. When leading a best-of-7 MLB/NBA/NHL playoff series 2-games-1, the Boston Celtics have a series record of 48-5 (with an active five-series winning streak) and a Game 4 record of 22-31. When trailing a best-of-7 MLB/NBA/NHL playoff series 2-games-1, the Philadelphia 76ers have a series record of 2-17 (with an active seven-series losing streak) and a Game 4 record of 8-11. Trailing a best-of-7 NBA playoff series 2-games-1 (as they now do in series 1633), the Philadelphia 76ers notched their only two series comeback victories in 2001, in series 838 in the 2001 NBA Quarterfinals round over the Toronto Raptors, and in series 842 in the 2001 NBA Semifinals round over the Milwaukee Bucks. The Philadelphia 76ers have a 0-4 series record against the Celtics when trailing Boston 2-games-1 in a best-of-7 NBA playoff series.

After Game 2: The Philadelphia 76ers visited and defeated the Boston Celtics 111-pts-97 to tie best-of-7 MLB/NBA/NHL playoff series 1633 at 1-game-all. When tied 1-game-all in a best-of-7 MLB/NBA/NHL playoff series, the Boston Celtics have a series record of 32-15 and a Game 3 record of 26-21, while the Philadelphia 76ers have a series record of 10-16 and a Game 3 record of 15-11. In the history of best-of-7 NBA playoff series (1947-2025, inclusive), teams such as the Boston Celtics in series 1633 which win Game 1 at home by double digits and then lose Game 2 at home by double digits have a series record of 14-6.

After Game 1: The Boston Celtics hosted and defeated the Philadelphia 76ers 123-pts-91 to take a best-of-7 MLB/NBA/NHL playoff series 1633 lead of 1-game-nil. When leading a best-of-7 MLB/NBA/NHL playoff series 1-game-nil, the Boston Celtics have a series record of 65-8 (with an active six-series winning streak) and a Game 2 record of 46-27. When trailing a best-of-7 MLB/NBA/NHL playoff series 1-game-nil, the Philadelphia 76ers have a series record of 5-24 (with an active five-series losing streak) and a Game 2 record of 14-15. In the history of best-of-7 NBA playoff series (1947-2025, inclusive), teams such as the Boston Celtics in series 1633 which win Game 1 by 32 points have a 5-1 series record and a 5-1 Game 2 record.

Pre-series assessment: In the 2025-26 NBA regular season, the Boston Celtics finished eleven games ahead of the Philadelphia 76ers. From 1947 through the 2025 NBA Finals round, when NBA teams led their best-of-7 playoff series opponents by eleven regular-season games, they have posted a best-of-7 playoff series record of 28-5 (.848) with an active ten-series winning streak in those series against those opponents. Best-of-7 MLB/NBA/NHL playoff series 1633 is the 113rd best-of-7 NBA playoff series for the Boston Celtics, and the 57th for the Philadelphia 76ers. In best-of-7 NBA playoff series, the Boston Celtics have an all-rounds series record of 79-33, a Preliminary-round series record of 14-6, and a Game 1 record of 73-39, while the Philadelphia 76ers have an all-rounds series record of 24-32, a Preliminary-round series record of 7-6, and a Game 1 record of 27-29. Series 1633 is the fifteenth best-of-7 NBA playoff series meeting between the Boston Celtics and the Philadelphia 76ers. In their previous fourteen best-of-7 NBA playoff series against each other, the Boston Celtics hold a 10-4 lead over the Philadelphia 76ers, with an active five-series winning streak against the 76ers.