Joe Pavelski figured if the extra goal wasn't going to come, then the Sharks needed extra defense. Martin Jones happily obliged.
Logan Couture and Joel Ward scored in the first period and San Jose gave the Chicago Blackhawks their second straight loss with a 2-1 victory on Wednesday night.
Artemi Panarin scored for the Blackhawks, who have back-to-back losses for the first time since opening the season 0-2. They also fell to the Oilers 5-0 on Monday night.
Jones, who had his 15th career shutout Monday, stopped 33 shots for his 10th win of the year.
Corey Crawford saved 33 shots for the Blackhawks, who entered with points in 10 of their last 12 games against San Jose.
The Blackhawks will complete their seven-game trip with back-to-back games at the Anaheim Ducks on Friday and Los Angeles Kings on Saturday.
The Sharks will continue their homestand with a game against the New York Islanders on Friday.