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 a list of titles followed by names, which can lead to confusion when using only commas. Semicolons would effectively separate the elements to clarify the structure. The corrected version would be:
"The captains of the high-school softball team are pitcher: Marisa Martino; outfielder: Rachel Morrison; and catcher: Lisa Fiore."
(Note: In this correction, I also used colons to introduce the names.)