Major League Baseball says Yearwood will sing "The Star-Spangled Banner" before Game 1 on Tuesday when the San Francisco Giants play the Kansas City Royals at Kauffman Stadium in Kansas City, Missouri.
Santana will perform an instrumental rendition of the national anthem with his son before Game 4 on Saturday at the AT&T Park in San Francisco.
Former "American Idol" winner Phillip Phillips will sing before Game 2 on Wednesday. Country quartet Little Big Town will sing before Game 3 on Friday.
The games will air on Fox at 8 p.m. Eastern time.
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