Final answer:
The underlined passage has a punctuation error which should be corrected by adding a comma or the word 'and' between 'pitchers catchers'.
Step-by-step explanation:
The underlined passage contains an error in punctuation. The comma between 'pitchers catchers' should be replaced with either a comma to separate the list properly or the word 'and' to join the last two elements in the list. The corrected sentence should therefore read:
'By his talent and physical presence, he disrupted the concentration of pitchers, catchers, and middle infielders.'
Or
'By his talent and physical presence, he disrupted the concentration of pitchers, catchers and middle infielders.' if following a style that uses the Oxford comma.