The Detroit Tigers activated right-hander Reese Olson from the injured list to start Friday’s game against the Cleveland Guardians.The Tigers opened a roster spot late Thursday when outfielder Justyn-Henry Malloy was optioned to Triple-A Toledo.Olson, 25, was 4-3 with a 2.96 ERA in nine starts before he went on the IL with inflammation in his right ring finger. In three seasons with Detroit, he is 13-18 with a 3.60 ERA in 52 appearances (49 starts).