Wout van Aert picked up a second win of the 2020 Tour de France on Friday as aggressive tactics and crosswinds combined to produce an enthralling race that claimed several victims.

British rider Adam Yates retained the yellow jersey while Peter Sagan took the green points jersey after his Bora team led a carefully plotted and brilliantly executed attack to drop his sprint rivals.

The unflappable Yates said he had been expecting an easy day, on what was billed as a straightforward flat run through France's rugby club heartland round Albi, ahead of two monster Pyrenean stages.

"It was full gas all the way today, from start to finish there were anxious moments," said the yellow jersey whose rivals young Slovenian Tadej Pogacar, Colombian Richard Carapaz, Spaniard Mikal Landa and Australian veteran Richie Porte all trailed home 1min 21sec adrift.

The plot unfolded from 150km as Bora launched an unexpected assault, cranking up the pace with attacks that succeeded in exploiting the crosswinds, splitting the pack and shedding Sagan's rivals in the points classification, Irishman Sam Bennett who started the day in green, and Australian Caleb Ewan.

"Our director was against the idea at first, but we did this once in 2013 and it worked, I won," said Sagan, who only came 13th after his bike lost its chain at the critical moment in the sprint.

Egan Bernal the 23-year-old Ineos leader seemed unconcerned by teammate and compatriot Carapaz's plunge down the standings. Carapaz, a Giro d'Italia champion has always looked liked the backup plan for Ineos.

"Today was okay, I'm more focussed on the weekend with two really hard mountain stages," said the slightly built Bernal who performs remarkably well on the plains.

"I'm going back to my bus to relax and focus on the mountains," he said.

Jumbo's Belgian all-rounder Van Aert also won stage five and on Friday outsprinted a small leading group.

'Totally hectic'

"All the sprinters were dropped already and afterwards it was totally hectic," said the Jumbo rider at the finish line.

"It was a good day for the team as some favourites from the GC lost time too," said Van Aert, whose team leader Slovenian Primoz Roglic is the Tour favourite.

"I got a slipstream, found a gap and timed my sprint perfectly," said Van Aert. "But this is more of a surprise than the last win."

The stage embarked within sight of the 336m-high Millau viaduct that reaches across the Tarn Gorge, where winds also hit the Tour in 2019.

"Everyone expected a quiet day before the mountain but Bora had their ideas. It was very hard from start to finish," said Yates. "It means that the  next two days will be harder."

Saturday's run from Cazeres-Sur-Garonne to Loudenvielle features two category one mountains and one beyond-category climb, but both the weekend races end with dangerous  descents.

"They'll be going for it," Yates predicted when asked if he feared attacks.

"I need to get on my computer and do a bit of recon, but I don't mind racing downhill, especially on those big Pyrenean roads."

Sunday's stage nine has five climbs on its 153km run from Pau to Laruns, ending in a 20km descent.