Fabian Cancellara has decided to end his 2012 season, citing physical and mental fatigue.
The Swiss rider had been down to ride the UCI Road Cycling World Championships for his country, but has instead chosen to undergo surgery on his clavicle to remove the screws that have held the now healed bone in place since his crash at the Tour of Flanders.
It ends another solid season from Cancellara who took wins at Tirreno-Adriatico, the Strade Bianche and the prologue at the Tour de France.
He was also a podium finisher at Milan-San Remo and wore the yellow jersey at the Tour de France for the first week.
His Classics campaign was lost when he broke his collarbone at the Tour of Flanders, ruling the Swiss rider out of his signature race, Paris-Roubaix, and denying a real sporting contest between him and an almost unstoppable Tom Boonen.
Cancellara will return to training in October as he prepares for 2013.