Cody Eakin tied it at 12:58 of the second period and rookie Alex Chiasson scored the only goal of the shootout to lift the Dallas Stars to a 4-3 win over San Jose on Thursday night that ended the Sharks' perfect start to the season.
The Sharks (6-0-1) fell one game shy of tying the best start in their history, last season's 7-0 beginning.
Dallas also got goals from Tyler Seguin and Trevor Daley. Dan Ellis stopped 32 shots.
Tyler Kennedy, Matthew Nieto and Patrick Marleau scored for San Jose. Antti Niemi made 28 saves.
The Stars outshot San Jose 31-29 in regulation, but the Sharks took all five shots on goal in the overtime.