BOSTON—Even though the Orioles’ Opening Day game against the Boston Red Sox has been postponed until Friday, they did have to set their 26-man roster.

Right-handed pitcher Shawn Armstrong begins the season on the paternity list, allowing the team to carry Cole Sulser and Dillon Tate among its 14 pitchers.

Travis Lakins was optioned to Triple-A Norfolk, and outfielder DJ Stewart was placed on the 10-day injured list because of a strained left hamstring.

Two players, right-hander Hunter Harvey (oblique) and first baseman Chris Davis (back), are on the 60-day injured list and don’t count against the 40-man roster.