Padres on the mound:
Chris Young pitched four shutout frames before allowing three earned runs in his last inning. Woody Williams and Scott Linebrink combined for three innings of scoreless relief.
Cubs on the mound:
Starter Sean Marshall retired the first two batters of the game, then gave up a single, a walk, a run-scoring double and Castilla's homer. He gave up six runs, all earned, on seven hits over 4 2/3 innings.
The teams square off again Saturday at noon PT at Cashman Field in Las Vegas. Las Vegas product Greg Maddux gets his final spring tuneup for Chicago, while the Padres counter with right-hander Dewon Brazelton.
Patrick Donnelly is a contributor to MLB.com This story was not subject to the approval of Major League Baseball or its clubs.