BOSTON -- The Red Sox placed right-hander Nick Pivetta on the 15-day injured list Tuesday with a right elbow flexor strain, their latest key player to be sidelined in a week.

Boston is off to a 7-3 start and hosts Baltimore in its home opener Tuesday. Pivetta (1-1, 0.82 ERA) has made two starts this season, allowing one run and eight hits over 11 innings with 13 strikeouts.

He was scheduled to start Wednesday, the second game of the series. The Red Sox recalled left-hander Brennan Bernardino from Triple-A Worcester to take Pivetta's place on the roster.

Pivetta's injury comes after shortstop Trevor Story was placed on the 10-day IL after dislocating his left shoulder last week in a game against the Angels. On Tuesday, chief baseball officer Craig Breslow said that Story will have season-ending surgery to repair a fracture in his shoulder.

The Associated Press contributed to this report.