ST. LOUIS — Michael McGreevy tossed six scoreless innings, Jordan Walker homered and drove in a pair of runs and the St. Louis Cardinals beat the Chicago Cubs 5-0 on Friday night.

McGreevy (4-2) allowed six hits and a walk, and Matt Svanson, JoJo Romero and Riley O’Brien pitched the final three shutout innings in relief.

Matthew Boyd (11-5) allowed three runs on seven hits and struck out three in five innings for the Cubs, who have lost four of six to fall five games behind the division-leading Milwaukee Brewers in the NL Central.

Walker hit his fourth home run of the season off Ryan Brasier in the sixth inning to put the Cardinals ahead 4-0. It was Walker’s first homer since May 17 in Kansas City, Mo.

Iván Herrera hit a sacrifice fly, and Willson Contreras added an RBI single in the f

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