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The 1973 Canadian-American Challenge Cup was the eighth season of the Can-Am auto racing series. It consisted of FIA Group 7 racing cars running two-hour sprint events. It began June 10, 1973, and ended October 28, 1973, after eight rounds. The season came amid the Oil Crisis, which ended interest in performance cars after an already-declining market over a several-year period. The golden age of the Trans Am Series ended after the 1972 season, leaving Can Am and Formula 5000 as the frontrunners of the SCCA. The season was also the penultimate season of the series, which would fold after 1974 before being revived in an entirely reworked series based on F5000 a few years later.

Schedule

For 1973, the schedule was altered as the season continued on. The first race ran in a standard, single race format. Rounds two through four ran as two heats, with the results being determined by combined results. Rounds five through eight ran a Sprint qualifying heat first to determine the starting order for the Cup event. The results of the Sprint and Cup were not combined.

Rnd	Race	Circuit	Date
1	Labatt's Blue Trophy	Mosport Park	June 10
2	Carling Can-Am	Road Atlanta	July 8
3	Watkins Glen Can-Am	Watkins Glen International	July 22
4	Buckeye Cup	Mid-Ohio Sports Car Course	August 12
5	Road America Can-Am	Road America	August 26
6	Molson Cup	Edmonton Speedway Park	September 16
7	Monterey Castrol Grand Prix	Laguna Seca Raceway	October 14
8	Los Angeles Times Grand Prix	Riverside International Raceway	October 28

Season results

Rnd	Circuit	Winning Team	Results
Rnd	Circuit	Winning Driver	Results
1	Mosport	#23 Rinzler Motoracing Royal Crown	Results
1	Mosport	Charlie Kemp	Results
2	Road Atlanta	#16 Rinzler Motoracing Royal Crown	Results
2	Road Atlanta	George Follmer	Results
3	Watkins Glen	#6 Roger Penske Enterprises	Results
3	Watkins Glen	Mark Donohue	Results
4	Mid-Ohio	#6 Roger Penske Enterprises	Results
4	Mid-Ohio	Mark Donohue	Results
5	Road America	#6 Roger Penske Enterprises	Results
5	Road America	Mark Donohue	Results
6	Edmonton	#6 Sunoco Porsche+Audi	Results
6	Edmonton	Mark Donohue	Results
7	Laguna Seca	#6 Roger Penske Enterprises	Results
7	Laguna Seca	Mark Donohue	Results
8	Riverside	#6 Roger Penske Enterprises	Results
8	Riverside	Mark Donohue	Results

Drivers Championship

Points are awarded to the top ten finishers in the order of 20-15-12-10-8-6-4-3-2-1.

Pos	Driver	MOS	ATL	WGL	MOH	ROA	EDM	LAG	RIV	Pts
1	Mark Donohue	7	2	1	1	1	1	1	1	139
2	George Follmer	13	1	20	2	3	2	11	20	62
3	Hurley Haywood	15	5	21	3	14	DNS	3	2	47
4	Charlie Kemp	1		4	DNS	12	8	13	3	45
5	Bob Nagel	3	6	11	13	6	7	6	4	44
6	Jody Scheckter	16	3	3	20	2	12	16	13	39
7	David Hobbs	Wth	4	2	19	Wth	4	9	18	37
8	Scooter Patrick	4	18	10	18	4	6	8	10	31
9	Jackie Oliver	20	19	17	8	DNS	3	2	17	30
10	Steve Durst	5	7	7	10	DNS	5	10	8	29
11	Bobby Brown			16	5	5	11	4	19	26
12	Milt Minter		17					5	5	16
13	Hans Wiedmer	2	16	15	23					15
14	Tom Dutton	12	11	6	7	15	10	21	7	15
15	John Cannon	6		5				17	15	14
16	Derek Bell				4	DNS				10
17	Bob Peckham				11	Wth		7	6	10
18	Danny Hopkins		13	13	6	9	15			8
19	Tom Heyser		8	8	16	10				7
20	Gary Wilson				9	7			DNS	6
21	Ed Felter	8	10	18	12	16		20		4
22	John Cordts	9	12	19	14	Wth	9	14	14	4
23	Warren Agor	19	14	12	15	8				3
24	Pete Sherman	10	9	14	17					3
25	Peter Gregg			9						2
25	Hans Müller-Perschl							Wth	9	2
	Brian Redman							12	11	0
	David Saville-Peck	18			21	11	14	22	Wth	0
	William Wonder	11								0
	Frank Kahlich	Wth							12	0
	John Gunn						13	23	Wth	0
	Jigger Sirois					13				0
	Jim Butcher	14	Wth							0
	Vic Elford							15	21	0
	Lothar Motschenbacher		15							0
	Sam Posey								16	0
	Dick Durant	17				DNS				0
	Bill Cuddy							18		0
	Tony Settember							19	Wth	0
	Gene Fisher		20							0
	Willi Kauhsen				22					0
	Mario Andretti		DNS					DNS	DNS	0
	James Hunt					DNS				0
	Dan Kampo					DNS				0
	Dave Causey					DNS				0
	Monte Shelton						DNS			0
	Bob Earl								Wth	0
Pos	Driver	MOS	ATL	WGL	MOH	ROA	EDM	LAG	RIV	Pts

Color	Result
Gold	Winner
Silver	2nd place
Bronze	3rd place
Green	4th-6th place
Light Blue	7th–10th place
Dark Blue	Finished (Outside Top 10)
Purple	Did not finish
Red	Did not qualify (DNQ)
Brown	Withdrawn (Wth)
Black	Disqualified (DSQ)
White	Did not start (DNS)
Blank	Did not participate (DNP)
	Driver replacement (Rpl)
	Injured (Inj)
	Race not held (NH)
	Not competing

In-line notation
Bold	Pole position

References

"Canadian-American Challenge Cup 1973". World Sports Racing Prototypes. 2 October 2005. Archived from the original on 2008-06-02. Retrieved 2008-01-19.
"Can-Am - final positions and tables". World Sports Racing Prototypes. 2 October 2005. Archived from the original on 2008-05-31. Retrieved 2008-01-19.