He joined the Phillies before Tuesday's game against the Nationals at Citizens Bank Park, one of six September callups from Triple-A. He is a candidate to be on the Phillies' bench next season as the backup catcher.
"It's the dream I've had since I could pick up a baseball," Rupp said. "It's a dream come true."
Rupp should get a chance to play this month, too.
"All of the guys are here to get a look," Phillies interim manager Ryne Sandberg said. "I was told he was one of the most improved players in the Minor Leagues. He really came a long way. Personally, I want to see where he's at, what he can do."
That is fine with Rupp.
"Obviously, I wanted to get here as fast as I could," he said. "But I just wanted to go out and take advantage of the opportunities I was given and come out and play every day."
Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.