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"It was a big home run," Castro told MiLB.com. "He even said it before the inning. He said, 'I'm going to hit it out.' ... He told me, he said, 'I'm going to hit it out. We're going to win this game.' And he did."
The homer was Jimenez's lone hit in the game, but the 19-year-old also drove in a run with a groundout in the seventh and led all players with four RBIs.
"I'm feeling very well," Jimenez told MiLB.com. "Just stay present, in the moment. Look for my pitch and when I see the ball, I just hit. ... I keep playing hard."
Jimenez's blast was pivotal, but Cubs' No. 12 prospect Donnie Dewees was also a big offensive contributor.
Dewees went 2-for-4 with an RBI, walk and a stolen base. He also scored a trio of runs.
A second-round pick in 2015, Dewees is hitting .259 in 66 games with South Bend this season, while Jimenez is raking at a .341 clip.
Carson Sands, the Cubs' No. 23 prospect, gave up a pair of hits, but pitched 2/3 of an inning and didn't give up a run in the slugfest.
Trevor Mitsui, a D-backs farmhand, was the offensive star for the West. The 23-year-old went 2-for-3 with a double and three RBIs.
William Boor is a reporter for MLB.com. Follow him on Twitter at @wboor. This story was not subject to the approval of Major League Baseball or its clubs.