But the Sharks erased that lead in a flash.
The first goal came when Joe Pavelski won a faceoff to Marc-Edouard Vlasic, whose shot deflected toward Kennedy, who knocked it in for his second goal of the season 3:19 into the period.
Then just over a minute later, Hertl took a rebound of Scott Hannan's shot and skated around the net for a wraparound goal that was his ninth of the season.
The Sabres appeared on their way to a rare win when Tallinder scored midway through the third and then they had a two-man advantage later in the period. But Jamie McBain hit the post during the 5-on-3, and the Sharks tied it late in the period shortly after a penalty to Marcus Foligno ended.
Wingels dove into the crease to knock in the loose puck to tie the game and excite the sellout crowd.