LEADING OFF

A look at what’s happening around the majors today:

SWING KINGS: Major League Baseball is set to announce the participants for next week’s Home Run Derby. Six of the eight players are already known — Vladimir Guerrero Jr., Christian Yelich, Ronald Acuña Jr., Pete Alonso, Josh Bell and Carlos Santana. The 20-year-old Guerrero will be the youngest participant ever, 116 days younger than Ken Griffey Jr. in 1990.

KEY FOR CLEVELAND: Mike Clevinger hopes a matchup against Kansas City can help him get right. After his masterful start to the season was cut short by a back injury, the Indians right-hander has had a lousy go of it. Over two starts since returning, he’s allowed 12 runs in 6⅓ innings, including a seven-run mishap against the lowly Orioles last time out. Cleveland is on the AL postseason bubble, and Clevinger’s status could influence the team’s direction at the trade deadline.

NO-CARP CARDS: St. Louis will be without Matt Carpenter through the All-Star break after placing the infielder on the IL on Tuesday with a lower back strain. Cardinals manager Mike Shildt said Carpenter was extremely ill over the weekend, taking three bags of intravenous fluids Sunday, and tweaked his back while laid up.

’PEN SHUFFLE: Steven Matz is moving to the bullpen for now as the Mets again overhaul a major problem area with a flurry of roster moves. Veteran relievers Jeurys Familia, Justin Wilson and Luis Avilán were reinstated from the injured list before Tuesday’s game against the Yankees.