1920 U.S. National Championships – Women's singles
| Women's singles | |
|---|---|
| 1920 U.S. National Championships | |
| Champion |  Molla Mallory |
| Runner-up | Marion Zinderstein |
| Score | 6–3, 6–1 |
| Draw | 76 |
| Seeds | – |
Molla Mallory defeated Marion Zinderstein 6–3, 6–1 in the final to win the women's singles tennis title at the 1920 U.S. National Championships. The event was played on outdoor grass courts and held at the Philadelphia Cricket Club in Chestnut Hill, Philadelphia from September 20 through September 25, 1920. It was Mallory's fifth U.S. National singles title.
Draw
Final eight
| Quarterfinals | Semifinals | Finals | ||||||||||||||||||
| Helene Pollak
| 6 | 8 | ||||||||||||||||||
| Edith Sigourney
| 3 | 6 | ||||||||||||||||||
| Helene Pollak
| 2 | 3 | ||||||||||||||||||
| Molla Mallory
| 6 | 6 | ||||||||||||||||||
| Molla Mallory
| 6 | 2 | 6 | |||||||||||||||||
| Eleanor Tennant
| 2 | 6 | 3 | |||||||||||||||||
| Molla Mallory
| 6 | 6 | ||||||||||||||||||
| Marion Zinderstein
| 3 | 1 | ||||||||||||||||||
| Eleanor Goss
| 6 | 6 | ||||||||||||||||||
| Martha Niles
| 4 | 2 | ||||||||||||||||||
| Eleanor Goss
| 3 | 4 | ||||||||||||||||||
| Marion Zinderstein
| 6 | 6 | ||||||||||||||||||
| Leslie Bancroft
| 4 | 2 | ||||||||||||||||||
| Marion Zinderstein
| 6 | 6 | ||||||||||||||||||