1973 Centennial Cup Champions: Portage Terriers (MJHL)
| Eastern Playdowns | Western Playdowns |
| Quarter-finals | Semifinals |
| Chatham Maroons vs. Wexford Raiders | Calgary Canucks vs. Penticton Broncos |
| Game 1: Raiders 4 Maroons 3 | Game 1: Canucks 5 Broncos 4 (Protested by Penticton – Result nullified) |
| Game 2: Maroons 5 Raiders 3 | Game 2: Broncos 5 Canucks 3 |
| Game 3: Raiders 4 Maroons 3 | Game 3: Broncos 3 Canucks 0 |
| Game 4: Maroons 5 Raiders 4 | Game 4: Canucks 8 Broncos 3 |
| Game 5: Maroons 6 Raiders 3 | Game 5: Broncos 8 Canucks 5 |
| Game 6: Raiders 9 Maroons 8 (OT) | Game 6: Broncos 6 Canucks 2 |
| Game 7: Maroons 8 Raiders 5 | Penticton wins best-of-seven series 4-1 |
| Chatham wins best-of-seven series 4-3 | |
| Humboldt Broncos vs. Portage Terriers | |
| Moncton Beavers vs. Buchans Miners | Game 1: Bronco 4 Terriers 2 |
| Game 1: Beavers 13 Miners 4 | Game 2: Terriers 5 Broncos 1 |
| Game 2: Beavers 7 Miners 2 | Game 3: Terriers 7 Broncos 4 |
| Game 3: Beavers 8 Miners 1 | Game 4: Terriers 8 Broncos 5 |
| Moncton wins best-of-five series 3-0 | Game 5: Broncos 7 Terriers 4 |
| Humboldt withdrew after Game 5 Portage wins series 3-2 |
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| Pembroke Lumber Kings vs. St. Paul Vulcans | |
| Game 1: Lumber Kings 6 Vulcans 5 | Abbott Cup Western Final |
| Game 2: Lumber Kings 6 Vulcans 5 | Penticton Broncos vs. Portage Terriers |
| Game 3: Vulcans 6 Lumber Kings 2 | Game 1: Broncos 5 Terriers 1 |
| Game 4: Lumber Kings 5 Vulcans 4 (OT) | Game 2: Broncos 6 Terriers 4 |
| Game 5: Lumber Kings 4 Vulcans 1 | Game 3: Terriers 5 Broncos 4 (OT) |
| Pembroke wins best-of-seven series 4-1 | Game 4: Broncos 5 Terriers 3 |
| Game 5: Terriers 6 Broncos 3 |
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| Semifinals | Game 6: Terriers 5 Broncos 3 |
| St. Jerome Alouettes vs. St-Jerome Alouettes | Game 7: Terriers 6 Broncos 2 |
| Game 1: Beavers 3 Alouettes 1 | Portage wins best-of-seven series 4-3 |
| Game 2: Alouettes 3 Beavers 2 | |
| Game 3: Alouettes 5 Beavers 2 | |
| Game 4: Alouettes 2 Beavers 1 | |
| Game 5: Alouettes 6 Beavers 5 | |
| St-Jerome wins best-of-seven series 4-1 | |
| Chatham Maroons vs. Pembroke Lumber Kings |
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| Game 1: Lumber Kings 7 Maroons 2 | |
| Game 2: Lumber Kings 3 Maroons 1 | |
| Game 3: Maroons 4 Lumber Kings 3 | |
| Game 4: Maroons 6 Lumber Kings 5 | |
| Game 5: Maroons 4 Lumber Kings 2 | |
| Game 6: Lumber Kings 5 Maroons 2 | |
| Game 7: Lumber Kings 6 Maroons 1 | |
| Pembroke wins best-of-seven series 4-3 | |
| Dudley-Hewitt Memorial Trophy Eastern Final |
|
| Pembroke Lumber Kings vs. St-Jerome Alouettes | |
| Game 1: Lumber Kings 5 Alouettes 4 |
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| Game 2: Alouettes 5 Lumber Kings 2 |
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| Game 3: Lumber Kings 9 Alouettes 3 |
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| Game 4: Lumber Kings 7 Alouettes 3 |
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| Game 5: Lumber Kings 4 Alouettes 0 |
|
| Pembroke wins best-of-seven series 4-1 |
|
| Centennial Cup Final | |
| Pembroke Lumber Kings vs. Portage Terriers | |
| Game 1: Terriers 7 Lumber Kinds 5 (OT) (@ Brandon) | |
| Game 2: Terriers 4 Lumber Kings 2 (@ Brandon) | |
| Game 4: Terriers 3 Lumber Kings 1 (@ Brandon) | |
| Game 4: Lumber Kings 6 Terriers 4 (@ Winnipeg) | |
| Game 5: Terriers 4 Lumber Kings 2 (@ Winnipeg) | |
| Portage wins best-of-seven series 4-1 | |
