… in 1969.
“Walter Godefroot, on his own, has broken Eddy Merckx’s winning run by taking the greatest of all the classics, Paris-Roubaix, in the most unexpected manner, alone two-and-a-half minutes in the lead. The blond Flandrian, a Tokyo Olympic medallist, is renowned more for his sprint than for his time trialing, but in a race marked by hail, rain, snow and gale-force head winds, he used his sprinting only to escape from the bunches.”
From Cycling April 19, 1969: