The San Francisco Giants placed relief pitcher Jake McGee (back) on the 15-day injured list ahead of Wednesday's game against the Colorado Rockies. In a corresponding move, the team activated third baseman Evan Longoria (finger) from the 10-day injured list and he is making his season debut on Wednesday. McGee is dealing with lower back tightness. The injury may explain the 35-year-old's struggles so far in May. Over 3.2 innings this month, he's allowed 11 hits and 10 runs (nine earned). McGee...