1971 Monte Carlo Open – Men's singles
# 1971 Monte Carlo Open – Men's singles

The 1971 Monte Carlo Open – Men's singles was an event of the 1971 Monte Carlo Open tennis tournament. Željko Franulović was the defending champion but did not compete in this edition. Third-seeded Ilie Năstase won the singles title by defeating first-seeded Tom Okker 3–6, 8–6, 6–1, 6–1 in the final.

## Seeds

* Tom Okker (final)
* Roger Taylor (semifinals)
* Ilie Năstase (champion)
* Jan Kodeš (first round)
* Ion Țiriac (semifinals)
* Manuel Orantes (second round)
* Pierre Barthès (quarterfinals)
* Ismail El Shafei (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 | Final |
| - | - | - | - | - | - | - | - | - | - |
| 2 | Roger Taylor | 6 | 5 | 1 | | | | | |
| 3 | Ilie Năstase | 2 | 7 | 6 | | | | | |
| 3 | Ilie Năstase | 2 | 7 | 6 | 3 | Ilie Năstase | 3 | 8 | 6 |
| | | | | | 1 | Tom Okker | 6 | 6 | 1 |
| 5 | Ion Țiriac | 4 | 0 | 6 | 1 | Tom Okker | 6 | 6 | 1 |
| 1 | Tom Okker | 6 | 6 | 4 | | | | | |

### 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 | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 2 | Roger Taylor | 6 | 6 | | | | | | | | | | | | | | | | |
| | José Luis Arilla | 4 | 2 | | 2 | Roger Taylor | 6 | 6 | 6 | | | | | | | | | | |
| | Patrice Dominguez | 6 | 5 | 7 | | Patrice Dominguez | 3 | 2 | 8 | | | | | | | | | | |
| | Wilhelm Bungert | 1 | 7 | 5 | | | | | | 2 | Roger Taylor | 3 | 6 | 6 | | | | | |
| 7 | Pierre Barthès | 6 | 6 | | | | | | | 7 | Pierre Barthès | 6 | 3 | 2 | | | | | |
| | František Pála | 3 | 4 | | 7 | Pierre Barthès | 6 | 6 | 6 | | | | | | | | | | |
| | Håkan Zahr | 6 | 6 | | | Håkan Zahr | 0 | 2 | 2 | | | | | | | | | | |
| | Bill Bowrey | 1 | 3 | | | | | | | | | | | | 2 | Roger Taylor | 6 | 5 | 1 |
| 3 | Ilie Năstase | 6 | 6 | | | | | | | | | | | | 3 | Ilie Năstase | 2 | 7 | 6 |
| | Jean-Loup Rouyer | 1 | 0 | | 3 | Ilie Năstase | 6 | 6 | 6 | | | | | | | | | | |
| | Wiesław Gąsiorek | 6 | 3 | 6 | | Wiesław Gąsiorek | 3 | 1 | 4 | | | | | | | | | | |
| | István Gulyás | 3 | 6 | 3 | | | | | | 3 | Ilie Năstase | 6 | 6 | 7 | | | | | |
| 6 | Manuel Orantes | 9 | 6 | | | | | | | | Dick Crealy | 3 | 4 | 9 | | | | | |
| | Wanaro N'Godrella | 7 | 4 | | 6 | Manuel Orantes | 6 | 4 | 3 | | | | | | | | | | |
| | Dick Crealy | 6 | 2 | 6 | | Dick Crealy | 4 | 6 | 6 | | | | | | | | | | |
| | Péter Szőke | 4 | 6 | 4 | | | | | | | | | | | | | | | |

### 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 |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| | Jan Kukal | 6 | 7 | | | | | | | | | | | | | | | | |
| | Jean-Baptiste Chanfreau | 4 | 5 | | | Jan Kukal | 8 | 0 | 6 | | | | | | | | | | |
| | Szabolcs Baranyi | 4 | 0 | | 5 | Ion Țiriac | 10 | 6 | 8 | | | | | | | | | | |
| 5 | Ion Țiriac | 6 | 6 | | | | | | | 5 | Ion Țiriac | 6 | 4 | 6 | | | | | |
| | Barry Phillips-Moore | w/o | | | | | | | | | Patrick Proisy | 4 | 6 | 3 | | | | | |
| | Graham Stilwell | | | | | Barry Phillips-Moore | 2 | 2 | 2 | | | | | | | | | | |
| | Patrick Proisy | 5 | 6 | 6 | | Patrick Proisy | 6 | 6 | 6 | | | | | | | | | | |
| 4 | Jan Kodeš | 7 | 3 | 1 | | | | | | | | | | | 5 | Ion Țiriac | 4 | 0 | 6 |
| | Boro Jovanović | 6 | 2 | 6 | | | | | | | | | | | 1 | Tom Okker | 6 | 6 | 4 |
| | François Jauffret | 2 | 6 | 4 | | Boro Jovanović | 6 | 6 | 6 | | | | | | | | | | |
| | Eric Drossart | 9 | 6 | | | Eric Drossart | 3 | 2 | 2 | | | | | | | | | | |
| 8 | Ismail El Shafei | 7 | 3 | | | | | | | | Boro Jovanović | 5 | 2 | 6 | | | | | |
| | Allan Stone | 6 | 4 | 6 | | | | | | 1 | Tom Okker | 7 | 6 | 1 | | | | | |
| | Jean-Claude Barclay | 4 | 6 | 0 | | Allan Stone | 2 | 2 | 3 | | | | | | | | | | |
| | Patrice Beust | 3 | 2 | | 1 | Tom Okker | 6 | 6 | 6 | | | | | | | | | | |
| 1 | Tom Okker | 6 | 6 | | | | | | | | | | | | | | | | |
