Cleveland put on a pitching clinic against Kansas City over the weekend, shutting out the Royals three straight games. Starters Ryan Merritt, Mike Clevinger and Carlos Carrasco each worked at least six innings, and an array of relievers cleaned up. The Indians opened up 9-game lead on third-place KC in the American League Central and are 6.5 up on Minnesota. The Tribe leads all of MLB with 15 shutouts and leads the AL with a 3.60 ERA. Behind the scenes, directing this show of arms, is Mickey Callaway, the ex-Ole Miss pitcher now in his fifth year as manager Terry Francona’s pitching coach. The Indians have ranked among the league ERA leaders in each of those seasons. Last year, with a staff thinned by injuries, Cleveland made it past Boston and Toronto in the playoffs and all the way to Game 7 of the World Series before falling to the Chicago Cubs. Callaway, widely considered managerial material, rates a chunk of credit in all of this. Next on the agenda for him and his staff is the New York Yankees in Yankee Stadium, a power-hitting team in a hitter’s park.