Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The 1983 U.S. Pro Indoor – Singles was an event of the 1983 U.S. Pro Indoor men's tennis tournament. The draw consisted of 48 players, 16 of them were seeded. First-seeded John McEnroe was the defending champion. He successfully defended his title, defeating second-seeded Ivan Lendl, 4–6, 7–6, 6–4, 6–3 in the final, breaking a seven-match losing streak against the Czech.
John Barrett, ed. (1984). World of Tennis 1984 : The Official Yearbook of the International Tennis Federation. London: Willow Books. pp. 126–127. ISBN0002181223.