Miami Marlins slugger Giancarlo Stanton expects to be sidelined for about a month because of a strained right hamstring. Stanton underwent an MRI exam Tuesday and said the diagnosis was a grade-two strain on the one-to-three scale for the injury. He was hurt trying to beat out a grounder in Monday's 15-inning victory over the New York Mets, and was placed on the 15-day disabled list.