World Champions pre-Championship careers tend not to be littered with wins. Here is the amount of World Championship races each World Champion won before their first World Championship season:
Zero
Guiseppe Farina (but we knew that)
Jack Brabham
Graham Hill
Denny Hulme
Keke Rosberg
One
Phil Hill (and it had a mass withdrawal)
John Surtees
Jochen Rindt
Emerson Fittipaldi
James Hunt
Mika Hakkinen (and he was let through)
Fernando Alonso
Jenson Button
Two
Alberto Ascari
Mike Hawthorn
Niki Lauda
Michael Schumacher
Three
Juan Manuel Fangio (although this is scarcely a fair test)
Jim Clark
Nelson Piquet
Four
Jacques Villeneuve
Lewis Hamilton
Five
Jackie Stewart
Alan Jones
Sebastian Vettel
Six
Mario Andretti
Ayrton Senna
Seven
Jody Scheckter
MORE THAN 7:
Kimi Raikkonen (9)
Damon Hill (13)
Alain Prost (16)
Nigel Mansell (21)
Zero
Guiseppe Farina (but we knew that)
Jack Brabham
Graham Hill
Denny Hulme
Keke Rosberg
One
Phil Hill (and it had a mass withdrawal)
John Surtees
Jochen Rindt
Emerson Fittipaldi
James Hunt
Mika Hakkinen (and he was let through)
Fernando Alonso
Jenson Button
Two
Alberto Ascari
Mike Hawthorn
Niki Lauda
Michael Schumacher
Three
Juan Manuel Fangio (although this is scarcely a fair test)
Jim Clark
Nelson Piquet
Four
Jacques Villeneuve
Lewis Hamilton
Five
Jackie Stewart
Alan Jones
Sebastian Vettel
Six
Mario Andretti
Ayrton Senna
Seven
Jody Scheckter
MORE THAN 7:
Kimi Raikkonen (9)
Damon Hill (13)
Alain Prost (16)
Nigel Mansell (21)