Baltimore Orioles shortstop Gunnar Henderson will begin the season on the injured list because of a mild right intercostal strain. General manager Mike Elias told reporters he hopes Henderson’s IL stint “will be measured in days instead of weeks.” The Orioles visit Toronto on Thursday for opening day. The 23-year-old Henderson departed a Feb. 27 spring training game after one inning because of discomfort on his lower right side. An intercostal strain involves the muscles around the ribs. Elias also told reporters that Cade Povich has been selected for the team’s No. 5 starter job.