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1973 Calendar
- Canadian Tire Motorsport Park
Canada
Round 1- 1st
Charlie Kemp - 2ndHans Wiedmer
- 3rdBob Nagel
- Road Atlanta
U.S.A.
Round 2- 1stGeorge Follmer
- 2ndMark Donohue
- 3rd
Jody Scheckter
- Watkins Glen International
U.S.A.
Round 3- 1stMark Donohue
- 2ndDavid Hobbs
- 3rdJody Scheckter
- Mid-Ohio Sports Car Course
U.S.A.
Round 4- 1stMark Donohue
- 2ndGeorge Follmer
- 3rdHurley Haywood
- Road America
U.S.A.
Round 5- 1stMark Donohue
- 2ndJody Scheckter
- 3rdGeorge Follmer
- Grand Prix Edmonton
Canada
Round 6- 1stMark Donohue
- 2ndGeorge Follmer
- 3rdJackie Oliver
- Laguna Seca
U.S.A.
Round 7- 1stMark Donohue
- 2ndJackie Oliver
- 3rdHurley Haywood
- Riverside International Raceway
U.S.A.
Round 8- 1stMark Donohue
- 2ndHurley Haywood
- 3rdCharlie Kemp