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.
Andrew Lapthorne defeated the defending champion Dylan Alcott in the final, 6–1, 6–0 to win the quad singles wheelchair tennis title at the 2019 US Open. Alcott was attempting to complete the Grand Slam.
Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, or of games won; 5. steering-committee decision.