Stewart’s Walk-off HR Lifts US Over Japan 2-1 for 5-0 RecordStewart’s Walk-off HR Lifts US Over Japan 2-1 for 5-0 RecordKelsey Stewart homered leading off the seventh inning to cap a late rally that gave the United States a 2-1 victory over Japan to win the group stage at the Olympics.Associated PressAssociated Press