"Casilla, what a job," San Francisco manager Bruce Bochy said, "and it's been a while since he's been out there [May 10]. He was really locked in."
Casilla is 9-for-11 in save opportunities this season. The 34-year-old right-hander (4-0, 1.76 ERA), has struck out 14 in 15 1/3 innings.
Baseball Almanac lists 79 previous immaculate innings, including one by Milwaukee's Mike Fiers earlier this season, on May 7. It has happened in the ninth inning 15 times.
Andy Call is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.