# 1977 U.S. Clay Court Championships – Women's singles

Kathy May was the defending champion but was upset in her first match against Mary Hamm. Third-seed Laura duPont won the title beating Nancy Richey in the final.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Kathy May (first round)
* Janet Newberry (first round)
* Laura duPont (champion)
* Yvonne Vermaak (second round)
* Brigitte Cuypers (first round)
* Lesley Hunt (first round)
* Kathy Kuykendall (second round)
* Pam Teeguarden (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Nancy Richey | 6 | 6 | | | | | |
| | Iris Riedel | 3 | 3 | | | | | |
| | Iris Riedel | 3 | 3 | | | Nancy Richey | 4 | 3 |
| | | | | | 3 | Laura duPont | 6 | 6 |
| 3 | Laura duPont | 6 | 3 | 6 | 3 | Laura duPont | 6 | 6 |
| | Cynthia Doerner | 4 | 6 | 3 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 1 | K May | 1 | 2 | | | | | | | | | | | | |
| | M Hamm | 6 | 6 | | | M Hamm | 6 | 4 | 4 | | | | | | |
| | K Ebbinghaus | 6 | 7 | | | K Ebbinghaus | 4 | 6 | 6 | | | | | | |
| | M Struthers | 3 | 5 | | | | | | | K Ebbinghaus | 1 | 1 | | | |
| | N Richey | 6 | 6 | 6 | | | | | | N Richey | 6 | 6 | | | |
| | M Carillo | 7 | 4 | 3 | | N Richey | 6 | 6 | | | | | | | |
| | W Overton | 6 | 2 | 6 | | W Overton | 3 | 1 | | | | | | | |
| 5 | B Cuypers | 2 | 6 | 2 | | | | | | | | | N Richey | 6 | 6 |
| 4 | Y Vermaak | 7 | 6 | | | | | | | | | | I Riedel | 3 | 3 |
| | C Meyer | 6 | 3 | | 4 | Y Vermaak | 7 | 5 | 1 | | | | | | |
| | P Louie | 6 | 6 | | | P Louie | 5 | 7 | 6 | | | | | | |
| | L Boshoff | 4 | 3 | | | | | | | P Louie | 1 | 1 | | | |
| | L Forood | 3 | 3 | | | | | | | I Riedel | 6 | 6 | | | |
| | I Riedel | 6 | 6 | | | I Riedel | 3 | 6 | 6 | | | | | | |
| | K Harter | 1 | 2 | | 8 | P Teeguarden | 6 | 2 | 4 | | | | | | |
| 8 | P Teeguarden | 6 | 6 | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | L Hunt | 1 | 6 | 6 | | | | | | | | | | | | | | | |
| | M Bueno | 6 | 4 | 8 | | M Bueno | 6 | 6 | | | | | | | | | | | |
| | H Eisterlehner | 6 | 5 | 6 | | H Eisterlehner | 2 | 3 | | | | | | | | | | | |
| | B Bruning | 3 | 7 | 3 | | | | | | | M Bueno | 7 | 4 | 2 | | | | | |
| | K Latham | 7 | 2 | 6 | | | | | | 3 | L duPont | 5 | 6 | 6 | | | | | |
| | BA Stuart | 6 | 6 | 3 | | K Latham | 4 | 6 | 8 | | | | | | | | | | |
| | Z Liess | 6 | 3 | 0 | 3 | L duPont | 6 | 4 | 10 | | | | | | | | | | |
| 3 | L duPont | 2 | 6 | 6 | | | | | | | | | | | 3 | L duPont | 6 | 3 | 6 |
| 7 | K Kuykendall | 6 | 6 | | | | | | | | | | | | | C Doerner | 4 | 6 | 3 |
| | G Coles | 1 | 2 | | 7 | K Kuykendall | 5 | 2 | | | | | | | | | | | |
| | C Doerner | 6 | 6 | | | C Doerner | 7 | 6 | | | | | | | | | | | |
| | I Kloss | 1 | 2 | | | | | | | | C Doerner | 6 | 6 | | | | | | |
| | L Charles | 2 | 7 | 6 | | | | | | | L Charles | 3 | 1 | | | | | | |
| | F Bonicelli | 6 | 6 | 2 | | L Charles | 6 | 3 | 10 | | | | | | | | | | |
| | H Sparre | 6 | 6 | | | H Sparre | 1 | 6 | 8 | | | | | | | | | | |
| 2 | J Newberry | 2 | 3 | | | | | | | | | | | | | | | | |