When the Tour de France hits the cobblestones of Paris-Roubaix, it can be a major blow to the hopes of some GC contenders, and that proved predictably true on Wednesday's fifth stage to Wallers.

Primoš Roglic's dislocated shoulder mid-stage, dropping him two minutes, made headlines on what was a disastrous day for Jumbo Visma. But there were plenty of other tales of hardship for the riders, who battled through 11 cobblestone sections to finish just ahead of the most famous of them all.

For Bahrain-winning Hope Jack Haig, this year's Tour de France will be another case of "what could have been." After crashing on stage 3 last summer, Jack Haig became the first rider to abandon the race afterwards, this time after riding for two days.

The 28-year-old Haig was involved in a collision with a hay bale with 30km to go, when Roglic and Caleb Yuan also crashed. Hayg suffered a cut above his elbow, stitches, and back abrasions. According to Bahrain Victorious, a CT scan also revealed multiple non-displaced fractures in the wrist.

Ewan, meanwhile, suffered a "mild concussion," according to a post-stage medical report, and despite Simon Clark's escape to take the stage win, the pain was not over for the Australian rider.

AG2R Citroen leader Ben O'Connor finished the day 4:12 behind Clark, dropping him to 61st overall. After the race he recounted the day's episode, saying that he had a flat tire in the second cobblestone sector of the day and was unable to return before the race.

"I got a flat tire in the second sector," he said. 'The race started to split wide open. It was really hard to catch up. There were a million cars in between, too many bikes, and TV cameras everywhere. The TV cameras would come right in front of you and all of a sudden there would be a huge traffic jam.

"Maybe they all would have stopped right away. But there was Jeffrey [Bouchard], Mikael [Cherelle], and Benoit [Kosnefrois] at the start, and in the end Ollie [Naessen] and Bob [Jungels] stayed with me to the end."

"For the last 40km it was just those two. We worked as a team to try and make it to the time trial. But again we lost time in the pavé with the machine."

O'Connor finished in a group with Michael Woods, co-leader of Israel Premier Tech, who had already dropped to 92nd place, and Louis Maintus, GC Hope of Intermarché Wantigovert. Elsewhere, Astana's Alexey Lutsenko, who finished seventh in last year's race, fell to 50th overall, 2:50 behind.

"I was really unlucky," he said. 'I'm a little sad, a little disappointed. 'I'm a little sad because I've been really stressed the last few days and for once I feel calm, but there wasn't much else I could have done today.'

Elsewhere, the medical report noted that Roglic suffered "multiple contusions" in addition to a dislocated shoulder, which he put back together himself before continuing on to the finish.

Michal Gogl of Alpecin-Desseunink was the only other abstainer of the day besides Haig, and suffered the most serious injury of stage 5. The Austrian crashed with Daniel Oss and left the race with a broken collarbone and pelvis/iliac fracture.

The Total Energies rider was riding in the cobbled third sector when he collided with a spectator who was taking pictures with his cell phone. As a result, he suffered a cervical spine injury.

Numerous crashes and accidents occurred during the action-packed stage.