Guzman actually saw plenty of changeups in his pinch-hit at-bat against Rays pitcher Jeremy Hellickson -- six of them, in fact.
"He threw me six of them in a row," Guzman said Sunday. "I've never seen that before."
Guzman laid off a 2-2 changeup down and then took advantage of another changeup that Hellickson got up in the strike zone, sending it over the wall in left field.
"Buddy [manager Bud Black] came up to me during the game and told me that someone was going to hit a changeup hard," Guzman said. "He told me to be ready."
It was the first Padres pinch-hit grand slam since Josh Barfield hit one against the Giants on Aug. 17, 2006, and the first pinch-hit slam on the road since Melvin Nieves did so Aug. 26, 1995, against the Mets.
"I was watching the game all day [from the bench]," Guzman said. "He [Hellickson] believed in that pitch."
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.