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15 - Number of days remaining until the 2016-17 season. But it's also...
...the number of sets of back-to-back games played by the Caps last year (including a rare home-home set, part of a winter weather-induced three games in four nights at Verizon Center). They compiled a 22-7-1 record in those games, a franchise-best .750 points percentage when playing two in two.
The Caps will face 16 sets of back-to-back games in the upcoming season.
(via Caps' Playoff Guide)