Paris-Roubaix: Five outsiders to watch

It's not all about Tom Boonen (Quick-Step Floors) and Peter Sagan (Bora-Hansgrohe). The retiring Belgian and the world champion have dominated the prognostics ahead of Paris-Roubaix, but the Queen of the Classics throws up surprises like few other races. Just ask last year's winner Mat Hayman. But who are the outsiders who might upset Quick-Step, Sagan and Greg Van Avermaet (BMC) et al on Sunday?