Yankees’ Gary Sanchez slump is getting more concerning

Gary Sanchez ’s slump hasn’t let up. He finished the homestand with a hitless afternoon and has just 10 hits in his past 75 at-bats. In that 19-game stretch, Sanchez has three extra-base hits and six walks, while striking out 26 times. “I don’t feel he’s far off,” Boone said Sunday as the Yankees lost…