1909 U.S. National Championships – Women's singles
# 1909 U.S. National Championships – Women's singles

Hazel Hotchkiss won the singles tennis title of the 1909 U.S. Women's National Singles Championship by defeating reigning champion Maud Barger-Wallach 6–0, 6–1 in the challenge round. Hotchkiss had won the right to challenge Barger-Wallach by defeating Louise Hammond 6–8, 6–1, 6–4 in the final of the All Comers' competition. The event was played on outdoor grass courts and held at the Philadelphia Cricket Club in Wissahickon Heights, Chestnut Hill, Philadelphia from June 21 through June 27, 1909.

## Draw

### Challenge round

| Challenge Round | Challenge Round | Challenge Round | Challenge Round | Challenge Round |
| - | - | - | - | - |
| Maud Barger-Wallach | Maud Barger-Wallach | 0 | 1 | |
| Hazel Hotchkiss | Hazel Hotchkiss | 6 | 6 | |

### All Comers' finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Finals | Finals | Finals | Finals | Finals |
| - | - | - | - | - | - | - | - | - | - | - | - | - |
| Emily Scott | Emily Scott | 3 | 0 | | | | | | | | | |
| Hazel Hotchkiss | Hazel Hotchkiss | 6 | 6 | | | | | | | | | |
| Hazel Hotchkiss | Hazel Hotchkiss | 6 | 6 | Hazel Hotchkiss | Hazel Hotchkiss | 6 | 7 | | | | | |
| | | | | Edith Rotch | Edith Rotch | 2 | 5 | | | | | |
| Edith Rotch | Edith Rotch | 6 | 6 | Edith Rotch | Edith Rotch | 2 | 5 | | | | | |
| Alice Day | Alice Day | 1 | 0 | | | | | | | | | |
| Alice Day | Alice Day | 1 | 0 | | | | | Hazel Hotchkiss | Hazel Hotchkiss | 6 | 6 | 6 |
| | | | | | | | | Louise Hammond | Louise Hammond | 8 | 1 | 4 |
| Lois Moyes | Lois Moyes | 6 | 8 | | | | | | | | | | Louise Hammond | Louise Hammond | 8 | 1 | 4 |
| Margaret Roberts | Margaret Roberts | 1 | 6 | | | | | | | | | |
| Margaret Roberts | Margaret Roberts | 1 | 6 | Lois Moyes | Lois Moyes | 0 | 2 | | | | | |
| | | | | Louise Hammond | Louise Hammond | 6 | 6 | | | | | |
| Gwendolyn Rees | Gwendolyn Rees | 4 | 1 | Louise Hammond | Louise Hammond | 6 | 6 | | | | | |
| Louise Hammond | Louise Hammond | 6 | 6 | | | | | | | | | |
