AMIENS, France (REUTERS) - Dylan Groenewegen snatched his second win in a row on the Tour de France when he prevailed in awe-inspiring fashion in a bunch sprint at the end of the eighth stage on Saturday (July 14).

The Dutchman needed no help from his team mates in the final straight as he slalomed through his rivals to beat German Andre Greipel by almost a bike length after 181kms from Dreux.

Colombian Fernando Gaviria finished third and Belgian Greg van Avermaet retained the overall leader's yellow jersey.

Gaviria was boxed in by Greipel in the final 200m and the Colombian appeared to headbutt his rival's lower back in retaliation.

"My shape is getting better by the day, I'm proud that I won again today," said Groenewegen, who won the final stage on the Champs Elysees last year.

"(Peter) Sagan started very early and it was a bit messy, and I surged ahead. It was a good opportunity and I seized it."

One of the overall favourites, Ireland's Dan Martin who won the sixth stage on Thursday, crashed with 17kms left and lost one minute 16 seconds.

Martin hit the asphalt as the peloton was speeding up to get ready for the final sprint.

Three of his UAE Emirates team mates dropped back to help him regain his place in the bunch but Martin, with the back of his jersey ripped off and his left elbow bleeding, had to concede time ahead of a crucial ninth stage featuring 21.7kms of cobbled sectors.

All the other favourites spent a quiet day in another slow ride.

"It was a good day, no incident, I'm glad I still have the yellow jersey ahead of tomorrow's stage," said Van Avermaet, who leads Briton Geraint Thomas by seven seconds.