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 contains a list where each item includes additional descriptive information (position and name), making semicolons the appropriate choice to avoid confusion. The corrected version would be:
"The captains of the high-school softball team are pitcher, Marisa Martino; outfielder, Rachel Morrison; and catcher, Lisa Fiore."