There were years a cyclist seemed nearly invincible and took home more victories in one year than most cyclist do in an entire career.
Just listing some that came to my mind:
Gilbert 2011
-Uci World Tour
-National Championship (both road and TT)
-1 Tour stage (+ yellow jersey)
-Liegi-B-L
-Amstel Gold Race
-Fleche Wallone
-Clasica San Sebastian
-Strade Bianche
Cipollini 2002
-World Championship
-Milan-Sanremo
-6x Giro stages (+points classification)
-3x Vuelta stages
-Gent-Wevelgem
Cavendish 2009
-MilanSanremo
-6x Tour Stages
-3x Giro stages
Pantani 1998
- Giro + Tour
Cancellara 2008
-Gold (TT)+ Silver(road) Olympiads
-Milan-Sanremo
-Strade Bianche
-Tour of Swisse (corrected: points classification)
-Tirreno Adriatico
Boonen 2005
-World Championship
-2 Tour stages
-Rubaix+e3+Flanders
Petacchi 2003
-6 Giro stages
-4 Tour stages
-5 Vuelta stages
or 2004
-9 Giro stages (+points classification)
-5 Vuelta Stages
Contador 2008
Giro + Vuelta
Zabel 2001
-Milan-Sanremo
-3 Tour stages (+6th consecutive points classification)
-3 Vuelta stages
Just listing some that came to my mind:
Gilbert 2011
-Uci World Tour
-National Championship (both road and TT)
-1 Tour stage (+ yellow jersey)
-Liegi-B-L
-Amstel Gold Race
-Fleche Wallone
-Clasica San Sebastian
-Strade Bianche
Cipollini 2002
-World Championship
-Milan-Sanremo
-6x Giro stages (+points classification)
-3x Vuelta stages
-Gent-Wevelgem
Cavendish 2009
-MilanSanremo
-6x Tour Stages
-3x Giro stages
Pantani 1998
- Giro + Tour
Cancellara 2008
-Gold (TT)+ Silver(road) Olympiads
-Milan-Sanremo
-Strade Bianche
-Tour of Swisse (corrected: points classification)
-Tirreno Adriatico
Boonen 2005
-World Championship
-2 Tour stages
-Rubaix+e3+Flanders
Petacchi 2003
-6 Giro stages
-4 Tour stages
-5 Vuelta stages
or 2004
-9 Giro stages (+points classification)
-5 Vuelta Stages
Contador 2008
Giro + Vuelta
Zabel 2001
-Milan-Sanremo
-3 Tour stages (+6th consecutive points classification)
-3 Vuelta stages