'Olympic road race was the most difficult day in my career,' says Dan Martin

Climbs, cobbles and crashes force more than half the field to retire on a fiendishly tough day in Rio

Dan Martin in the men's road race at the 2016 Olympic Games (Watson)

(Image credit: Watson)

The world's top cyclists are used to being put through the wringer, but even they seemed shocked the Olympic road race, in which only 65 of the day's 144 starters made it to the finish.

The 237.5km course had been touted as the most difficult in Olympic history, and it certainly lived to the hype.

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