Harris, 24, was placed on the disabled list in mid-May with a shoulder injury. In 14 games this season, he is batting .200 (8-40), with one RBI and 10 strikeouts.
The 30-year-old Wunsch suffered the injury in the Giants' series on Wednesday and hasn't pitched since. In 22 games, Wunsch has a 1.15 ERA and opponents are batting .102 off him in 15 2/3 innings. The injury was retroactive to June 12.