Answer:
Assonance
Step-by-step explanation:
Assonance is the similarity or resemblance of words or sounds. It is the repetition of vowel sounds in nearby words and can affect the rhythm, tone, or mood of the any sound or text.
Repeating some certain vowel sounds can also create a melancholy mood
Here in this case, the sounds are similar both the times when ball hits the bat or it hits the mitt. Therefore, we can say that this is an example of assonance.