Momentum and series control hang over Game 2 between the Philadelphia 76ers and the Boston Celtics on April 21, 2026 — a contest that carries disproportionate weight given that teams winning the second game of a tied series convert that advantage into series victories at historically high rates. SportsLine's predictive model, which has logged a documented record of accuracy across prior playoff cycles, currently favors Boston, though the margin of that advantage remains a live variable as line movement continues. Philadelphia, should it secure a 2-0 lead, would shift the structural burden of the series entirely onto a Celtics roster that would then face the compounding pressure of road elimination games. Boston, conversely, needs a win simply to restore parity. The unresolved tension is whether Philadelphia's front-court depth can neutralize Boston's perimeter creation — a tactical question the model quantifies but Game 2 will ultimately answer.