In a must-win Game 6 on Friday night, manager Dave Roberts and the Dodgers turned to Yoshinobu Yamamoto to make his third career World Series start. Just like his past two outings on baseball’s biggest stage—including a nine-inning gem in Game 2— Yamamoto dazzled in a Dodgers win.

Los Angeles emerged victorious as baseball's first back-to-back champions since the New York Yankees won three straight from 1998 to 2000.

The Dodgers beat the Blue Jays 5-4 at Toronto’s Rogers Centre, making them the first Major League Baseball team to win back-to-back championships since the New York Yankees won three in a row from 19...