# 1971 National Indoor Championships – Singles

The 1971 National Indoor Championships – Singles was an event of the 1971 National Indoor Championships tennis tournament held at the Hampton Roads Coliseum in Hampton, Virginia in the United States from March 1 through March 7, 1971. Stan Smith was the defending champion but did not take part in this edition. First-seeded Ilie Năstase won the singles title, defeating Ilie Năstase 7–5, 6–4, 7–6$^{(5–0)}$ in the final. Năstase had survived five match points during his semifinal match against Željko Franulović.

### 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 | Semifinals | Final | Final | Final | Final |
| Ilie Năstase | 1 | 6 | 6 | 5 | 7 | | | | |
| Željko Franulović | 6 | 0 | 2 | 7 | 5 | | | | |
| Željko Franulović | 6 | 0 | 2 | 7 | 5 | Ilie Năstase | 7 | 6 | 7 |
| | | | | | | Clark Graebner | 5 | 4 | 6 |
| Clark Graebner | 6 | 6 | 7 | | | Clark Graebner | 5 | 4 | 6 |
| Ion Țiriac | 2 | 2 | 5 | | | | | | |

## Top half

| First Round | First Round | First Round | First Round | Second Round | Second Round | Second Round | Second Round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| Ilie Năstase | 6 | 6 | | | | | | | | | | | | | |
| Bobby Heald | 3 | 0 | | Ilie Năstase | 6 | 6 | | | | | | | | | |
| Richard Russell | 6 | 4 | 6 | Richard Russell | 3 | 2 | | | | | | | | | |
| Nikola Špear | 2 | 6 | 4 | | | | | Ilie Năstase | 6 | 6 | | | | | |
| Frank Froehling | 4 | 6 | 7 | | | | | Frank Froehling | 4 | 1 | | | | | |
| Peter Curtis | 6 | 0 | 6 | Frank Froehling | 6 | 6 | | | | | | | | | |
| Tom Gorman | 1 | 7 | 6 | Tom Gorman | 1 | 4 | | | | | | | | | |
| Ian Crookenden | 6 | 5 | 4 | | | | | | | | | Ilie Năstase | 1 | 6 | 6 |
| Željko Franulović | 6 | 6 | | | | | | | | | | Željko Franulović | 6 | 0 | 2 |
| Ray Keldie | 4 | 3 | | Željko Franulović | 4 | 7 | 6 | | | | | | | | |
| Byron Bertram | 7 | 3 | 7 | Byron Bertram | 6 | 5 | 4 | | | | | | | | |
| Ingo Buding | 6 | 6 | 6 | | | | | Željko Franulović | 7 | 3 | 6 | | | | |
| José Edison Mandarino | 6 | 6 | | | | | | Jan Kodeš | 6 | 6 | 3 | | | | |
| Onny Parun | 2 | 3 | | José Edison Mandarino | 6 | 4 | 1 | | | | | | | | |
| Jan Kodeš | 6 | 6 | | Jan Kodeš | 4 | 6 | 6 | | | | | | | | |
| Hans Kary | 2 | 3 | | | | | | | | | | | | | |

## Bottom half

| First Round | First Round | First Round | First Round | Second Round | Second Round | Second Round | Second Round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| Clark Graebner | 6 | 3 | | | | | | | | | | | | | |
| Terry Addison | 2 | 0$^r$ | | Clark Graebner | 6 | 6 | | | | | | | | | |
| Martin Mulligan | 4 | 6 | 6 | Martin Mulligan | 4 | 2 | | | | | | | | | |
| Vladimír Zedník | 6 | 0 | 0 | | | | | Clark Graebner | 5 | 6 | 6 | | | | |
| Tom Edlefsen | 6 | 6 | | | | | | Jaime Fillol | 7 | 3 | 1 | | | | |
| Péter Szőke | 1 | 2 | | Tom Edlefsen | 3 | 4 | | | | | | | | | |
| Jaime Fillol | 6 | 6 | | Jaime Fillol | 6 | 6 | | | | | | | | | |
| Frank Parker | 3 | 4 | | | | | | | | | | Clark Graebner | 6 | 6 | 7 |
| Thomaz Koch | 6 | 7 | | | | | | | | | | Ion Țiriac | 2 | 2 | 5 |
| Joaquín Loyo-Mayo | 4 | 5 | | Thomaz Koch | 6 | 5 | 6 | | | | | | | | |
| Milan Holeček | 6 | 7 | | Milan Holeček | 1 | 7 | 4 | | | | | | | | |
| Jim McManus | 4 | 5 | | | | | | Thomaz Koch | 5 | 7 | 1 | | | | |
| Ion Țiriac | 6 | 7 | | | | | | Ion Țiriac | 7 | 6 | 6 | | | | |
| Mike Belkin | 3 | 6 | | Ion Țiriac | 6 | 6 | 6 | | | | | | | | |
| Manuel Orantes | 6 | 6 | | Manuel Orantes | 7 | 0 | 3 | | | | | | | | |
| Gerald Battrick | 3 | 3 | | | | | | | | | | | | | |