Gustavsson made 20 saves in Saturday's 5-4 overtime win over the Sabres.
Neither team could break a 4-4 tie in the third period, but Mats Zuccarello put Gustavsson in the win column with a power-play tally in OT. It was the 27-year-old netminder's 15th victory of the season, with half of them coming in his last 12 outings -- a stretch in which he's gone 8-1-2 with a .915 save percentage.