Kiwi cyclist Patrick Bevin has lost his team leader at the Tour de France.

Australian hope Richie Porte has been forced to abandon the Tour after crashing 10 kilometres into the ninth stage and suffering a suspected broken collarbone.

Kiwi Dion Smith crashed and injured himself. His Wanty-Groupe Gobert team reported on Twitter that Smith had fractured his left thumb, bruised his ribs and cheek and had stitches to his hand, but will continue.

"According to our team doc Smithy would be able to start in the 10th stage," the team tweeted.

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Porte said before the Tour de France that his hopes of dethroning Chris Froome rested on not having any more bad luck β€” such as the fall that knocked him out of last year's race.

Misfortune struck Porte again on Sunday when he was injured in a crash at the start of Stage 9 and couldn't continue in the three-week Grand Tour.

Much had been made of the day's trek across the much feared cobblestones of Roubaix as the 156.5-kilometer (97-mile) leg approached the Belgian border from its start in Arras.

But unlike Porte's accident in the 2017 Tour that happened on a mountain descent, this tumble took place on an asphalt road before Porte had even reached the first cobbled path.

After being involved in a group pile-up, Porte sat on the road clutching his right upper arm. He couldn't get back on his bike and was sent directly to the hospital in an ambulance.

BMC sports director Fabio Baldato said Porte appeared to break his collarbone.

"The shoulder went out and in. It was really painful," Baldato said. "He went down hard with the shoulder."

Porte had entered the day in 10th place at 57 seconds behind the leader, BMC teammate Greg Van Avermaet.


He was also nine seconds ahead of Froome with the race heading south to the Alps and Pyrenees mountains where the Australian could exploit his climbing skills.

To make matters worse for his team, its best option to take over from Porte as leader had a horrendous day on the cobbles. American Tejay van Garderen was one of several riders to fall and had mechanical trouble during the extremely tough course. He managed to keep going, but plummeted in the overall standings from third place at nine seconds back to 30th at more than six minutes behind.

"It was just a bad-luck day. In the first 5K we lose Richie, today I had three flats and crash," Van Garderen said. "It's a big hit for Richie and for the (team's title hopes) obviously."

Van Avermaet expertly navigated the cobbles, finishing second behind stage winner John Degenkolb, to increase his lead over Froome's Sky teammate Geraint Thomas in the overall standing to 43 seconds.

But Van Avermaet, the Olympic road race champion, is not a good climber and acknowledged that he has little chance of keeping the yellow jersey over the next three stages in the Alps.

"We know when we start the race that (overall lead) guys have problems on this kind of stage," Van Avermaet said. "I tried to give them confidence but it is hard. It is a big disappointment for the team that we lost Richie as soon as the race started."

Baldato said that with Porte out, and Van Garderen far behind, the team's only realistic goal is to try to get a stage win on the few remaining flat stages.

"We try to look for the end of the Tour to have some stages and enjoy the fun because of course the (title) and the podium is gone," he said..