MLA in-text citation style uses the author's last name and the page number. If the source doesn't include a page number then only use the last name of the author.
Answer:
"I guess Coach Rossi thought I did really well because he asked me to pitch a few before the inning was up."
Third person is when a story is narrated by one of the characters. If you only know the narrators thoughts, then it is third person limited. If you know others thoughts as well, then it is third person omniscient.