The sentence that requires semicolons instead of commas is:
The captains of the high-school softball team are pitcher, Marisa Martino, outfielder, Rachel Morrison, and catcher, Lisa Fiore.
This sentence includes multiple phrases that contain internal commas, which can create confusion. Using semicolons would clarify the list. It could be revised to:
The captains of the high-school softball team are: pitcher, Marisa Martino; outfielder, Rachel Morrison; and catcher, Lisa Fiore.