2011 US Open – Wheelchair quad singles

Defending champion David Wagner won the quad singles wheelchair tennis title at the 2011 US Open when Peter Norfolk retired from the final, with the score at 7–5, 3–1.

Round robin
''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.''