That result puts Porte one minute and 18 seconds behind Jumbo-Visma's GC leader Steven Kruijswijk, with other rivals also gaining significant time.
"The last week is definitely where the race is going to be won, but it's never nice to lose time like that," the Tasmanian said.
In the end, Trek-Segafredo finished 18th ahead of only AG2R La Mondiale, Total Direct Energie, Team Arkea Samsic and Wanty-Gobert Cycling Team.
First cab off the rank because a bulk of the team nursed Geraint Thomas slowly home after his crash in yesterday's sprint finale, Ineos reigned over the remainder of the stage from the plastic hot seats, covering the 27km course in 29 minutes and 17 seconds. Deceuninck-QuickStep were the closest to dethroning them, crossing the line within just one second.
But it was the final team to start, armed with the likes of vintage and new TT powerhouses Tony Martin and Wout van Aert, who toppled the slick Ineos outfit by 20 seconds, keeping Mike Teunissen in the race lead.

A happy Jumbo-Visma celebrate their victory in the Stage 2 TTT at the 2019 Tour de France Source: Getty
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A surprise winner of yesterday's stage to newer fans and pundits of the sport, the first Dutchman to wear the leader's jersey since 1989 will spend another day in yellow.
"Yesterday it was a dream come true, and it’s the case today again," Teunissen said. "We went hard from the start. Dylan [Groenewegen] did a good work at the beginning but because of the crash yesterday, he couldn’t stay for long and we had to work out our tactic without George [Bennett] because he’s too small although he felt good.
"The other guys were very strong. Everybody kept their pace. We heard we were the fastest. It gave us a lot of morale. We were flying.
"In the end, yesterday it was mainly me who took credit for the win, today it’s eight strong riders, the staff and everyone who contributed to the team’s success. It was very big goal for us to win this."
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