Red Sox outfielder Mookie Betts was named the 2018 American League Most Valuable Player on Thursday, adding an appropriate finishing touch to a magical year for a team that won a franchise-record 108 regular-season games and its fourth World Series in 15 seasons, and Brewers outfielder Christian Yelich earned the NL MVP honors after leading Milwaukee to an NL-best 96 wins and a return to the playoffs for the first time in 2011.