Young, who was scheduled to start on Friday night against Arizona will now pitch on Saturday night against the D-Backs while Maddux, originally slotted for Saturday, will go for his 350th win on Friday night against the D-backs' Dan Haren.
"There were a couple of reasons for the change," said Padres manager Bud Black. "Mad Dog [Maddux] threw on Sunday and Friday is his regular day. He threw 68 pitches. We find with Greg, like with most starting pitchers, they prefer the fifth day.
"With C.Y. [Young] he came out of Saturday's start a little tight in the elbow, in the back of the elbow," Black said. "We thought the extra days' rest would benefit him, sort of a double bonus -- keep Greg on a schedule after a real low pitch count and give C.Y. an extra day, with a little more than usual stiffness in the elbow."
Black said that Young looked at some video right after his last game and picked something up. He and pitching coach Darren Balsley talked about it after the game.
Young threw a side session on Wednesday and had a full bullpen session on Thursday.
With Young, it was "his separation and how high that arm goes up," said Black. "The glove sometimes goes a little too high sometimes and that's what he was working on."
Young allowed a home run to Dodgers leadoff hitter Rafael Furcal on the second pitch that he threw on Saturday at Dodger Stadium. Young struggled with his fastball command, walking four in three innings, all while allowing six earned runs on seven hits.
Sandy Burgin is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.