Centuries By John Spencer In Season 1977-1978
| Tournament | Total | Breaks - Venue | Breaks - Qualifying | Rate |
|---|---|---|---|---|
 1978 Pontins Professional |
1 | 100 | 34 | |
| 1978 World Championship |
2 | 138, 118 | 10.5 | |
| 1977 Canadian Open |
2 | 146, 107 | 37 |
| Tournament | Total | Breaks - Venue | Breaks - Qualifying | Rate |
|---|---|---|---|---|
| 1978 Pontins Professional |
1 | 100 | 34 | |
| 1978 World Championship |
2 | 138, 118 | 10.5 | |
| 1977 Canadian Open |
2 | 146, 107 | 37 |