0.887 - the save percentage of Carey Price in games against the Ottawa Senators in 2014-15.
Price has a lower save percentage against only 2 other teams this season - Chicago and (?!) Buffalo.
Now, be warned - that is in only 2 games, so there isn't really any predictive power in this number. It's further muddied by the split - .960 in one game, .821 in the other. It does, however, illustrate that the Sens have been able to crack the likely Vezina winner wide open once already this season.