For the second time in less than a month, Pittsburgh Pirates outfielder Gregory Polanco has been sidelined due to a hamstring injury. On Tuesday, Polanco was placed on the 10-day disabled list, retroactive to August 13, due to a left hamstring strain suffered in Saturday’s game against the Toronto Blue Jays. To account for the vacancy left on the active roster, the Pirates have recalled catcher Elias Diaz from Triple-A Indianapolis. Polanco suffered the injury while chasing down a fly ball. The fourth-year major leaguer left a game against the Colorado Rockies on July 21 due to tightness in his left hamstring, with the Pirates placing him on the 10-day disabled list the following day.