The Boston Celtics are poised to take a commanding 3-1 series lead over the Philadelphia 76ers in their upcoming Game 4 matchup on Sunday. Currently holding a record of 56-26, the Celtics, who are the No. 2 seed in the Eastern Conference of the 2026 NBA playoffs, secured a victory in Game 3 with a score of 108-100, regaining home-court advantage in the series.

In contrast, the 76ers, seeded seventh in the East with a record of 45-37, have not lost back-to-back home games since mid-February. However, they face a potential setback as Joel Embiid is listed as doubtful due to an appendectomy.

Tipoff is set for 7 p.m. ET at Xfinity Mobile Arena in Philadelphia. The teams have split their four regular-season encounters, and the Celtics are favored by 7.5 points according to the latest odds from FanDuel Sportsbook, with an over/under of 213.5 points.

Before placing any bets, it's essential to consider the insights from the SportsLine Projection Model, which simulates every NBA game 10,000 times. The model boasts a remarkable 24-9 record (73%) on top-rated NBA spread picks this season, yielding over $10,000 in betting profit for $100 players over the last eight-plus seasons.

Key betting lines include:

• Celtics vs. 76ers spread: Celtics -7.5
• Over/Under: 213.5 points
• Money Line: Celtics -294, 76ers +235

The model predicts that the total will go Under (213.5), reflecting Boston's strong trend of hitting the Under, with a 55-30 record (64.7%) across both the regular and postseason— the highest percentage in the NBA. Each of the three games in this series has gone under, indicating a low-scoring affair is likely.

For those interested in betting advice, the model's predictions are available at SportsLine, where users can find valuable insights for making informed decisions.