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."
In this case, semicolons would be used to separate items in a list when those items themselves contain commas. Correcting the sentence would look like this:
"The captains of the high-school softball team are pitcher, Marisa Martino; outfielder, Rachel Morrison; and catcher, Lisa Fiore."