The Senators generated more high-danger chances (5 to 4) yet lost 3-2 in overtime. That gap between opportunity and outcome is why Boston's 55% share of 5v5 expected goals (3.23–2.61) held firm.

Korpisalo (BOS) was the difference. He stopped all five Senators high-danger shots on 22 total saves, posting a 0.909 save percentage (+0.61 versus expected). Ullmark (OTT) turned aside 22/25 at 0.880, a respectable line against a team with better finishing.

Boston's edge was ruthless: 2/4 on high-danger chances (50%). Ottawa: 0/5. The Senators excelled elsewhere—two goals on 20 rush chances, three rebound opportunities generated—but the high-danger math did not follow. In a one-goal game, that conversion gap was everything.

Pavel Zacha ended it at 04:54 of overtime, poking home from the doorstep.

Boston also controlled shot attempts 25–22 (53% share). No single metric ran away, but the Bruins' finishing at close range while Ottawa's misfired sealed the result.

The model projects a 2.7–2.4 goal win for Ottawa and sizes the Senators at 55% win probability. The edge isn't hidden—it lies in what the Senators generate at 5v5 and what regression math suggests the Bruins will soon correct.

Ottawa dominates puck play: 56.0% expected goals share to Boston's 47.0%, with a Corsi% split of 53.0% to 49.0%. That isn't fluky. It's sustained territorial advantage that will translate to volume. Worse for Boston: they're -5 in goal differential over their last 10 games, evidence that the Bruins have underperformed even their own underlying metrics.

The Bruins' PDO is 1.023, well into regression territory. This index compounds save percentage and shooting percentage. When it climbs this high, mean reversion becomes arithmetic, not opinion. Pair regression risk with Boston's possession deficit, and the conclusion is unavoidable: the goal margin will tighten.

Rest stacks another layer onto Ottawa's advantage. Boston arrives on one day of recovery; Ottawa on five. That gap shapes everything downstream—skating sharpness, decision-making in the neutral zone, the execution of the forechecking that turns possession into chances. Complicate it further: J. Swayman, Boston's starter, faces a back-to-back. Watch for either a backup deployment or a tired starter forced to perform anyway.

The Senators' weaponization of their 5v5 advantage runs through Brady Tkachuk and Dylan Cozens. Tkachuk generates 1.19 expected goals per 60 minutes and carries 11 goals on a 7.5% shooting rate—process aligned with output. Cozens creates at 1.00 xG/60 and has 13 goals at 9.5% shooting, a second threat running hot within sustainable bounds.

Boston's Viktor Arvidsson offers the most prolific finish at 13.0% shooting on 1.04 xG/60, but that rate sits too high to sustain. Tanner Jeannot operates at lower volume—0.75 xG/60—but leverages an 8.3% shooting rate that offers cushion against variance.

Nick Jensen will shoulder Ottawa's defensive load. Elias Lindholm faces the same burden on Boston's blue line. Given the possession tilt, rest advantage, and Bruins' PDO trajectory, the model's lean holds.