Madison Bumgarner will pitch the World Series opener for the Giants at Kansas City on Tuesday.
Manager Bruce Bochy made the expected announcement Saturday as his team worked out, one day before traveling.
Royals manager Ned Yost announced prior to his team's workout that James Shields will face Bumgarner in Game 1.
"There's never been a question mark," Yost said. "We'll go James Shields in Game 1, Yordano Ventura in Game 2. That's as far as I'm going."
Via ESPN.com