In the extra session, Joe Thornton caught up to the puck at the right boards and stopped there. He looked up and sent a pass to the top of the right circle for Setoguchi, who snapped a shot on net that went off the stick of Detroit’s Henrik Zetterberg and sailed into the net for the win.
Dan Boyle tied the game with 4:08 to play in regulation while Thornton finished the game with three assists for the Sharks, who have a 3-0 lead in this series and will look to close it out in Detroit on Friday.
Antti Niemi stopped 38 shots for San Jose, which also went up 3-0 in the semifinals last season against Detroit before winning the series in five games.
Nicklas Lidstrom had a goal and an assist while Pavel Datsyuk and Patrick Eaves each had a goal for Detroit, which has dropped seven straight playoff games to San Jose by one goal. Jimmy Howard made 34 stops in the loss.