The 32-year-old Welshman, the third Briton to win the race after Chris Froome and Bradley Wiggins, secured Team Sky's sixth victory in the race from the past seven editions.
Thomas claimed the lead on stage 11 and held off a series of challengers, including team-mate and four-time champion Chris Froome, during three tough stages in the Pyrenees and a gruelling time-trial on Saturday. "We thought Froome was going to win it, if I'm being honest", Roberts said.
Australia's Richie Porte crashed out early in the Tour
American rider Lawson Craddock, who broke his shoulder in the opening stage and sits last overall, also broke down into tears upon reaching the finish. "I have dreamed about this for many years".
Thomas rode a yellow bicycle to match his yellow jersey and shared glasses of champagne with his teammates during the casual ride into Paris.
"It has been a great race - if we look at all our individual riders they are fantastic", Thomas, who won two mountain stages including one up the iconic Alpe d'Huez climb, told a news conference. Froome rode next to Thomas as they crossed the line and applauded.
Team Sunweb's Tom Dumoulin finished the Tour in second place with Froome a further 33 seconds behind in third place.
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The 34-year-old adds some help to a Cubs rotation that has underachieved this season, despite leading the National League Central. His Rangers contract contained a partial no-trade clause, but the Cubs were not among the teams he could block.
Sky - and consequently Thomas - became a target for many fans due to an asthma drug case involving Froome, stemming from last year's Spanish Vuelta. Late Scare " I just want to enjoy this, man.
It's a dream come true.
"It comes down to tomorrow but I can take confidence with how I'm riding, and what will be will be", he said.
Thomas, who now has another major honour to accompany his pair of Olympic gold medals on his mantlepiece, won the eleventh and twelfth stages in the Alps while continually picking up advantages elsewhere to accumulate a final time of 83 hours, 17 minutes and 13 seconds. I believed I could beat the guys here but to do it on the biggest stage of all over three weeks, it's insane.
The longest total lunar eclipse of this century is happening this Friday!
When the moon moves into the conical shaped shadow of the earth, it goes from being illuminated by the sun to being dark. The red color is a product of Earth's atmosphere , which scatters light from the sun and it is reflected onto the moon .
The mostly flat 116-kilometer (72-mile) leg began in Houilles just outside Paris and concluded with nine laps up and down the Champs-Elysees.
"Nico [Portal, Team Sky sports director] told me to relax, take it easy and just make sure I won the Tour".
Martin finished in the same time as Thomas but missed out a time bonus himself with Romain Bardet edging out the Irish cyclist for third place.
It took several laps of the inner-city circuit around the Champs-Elysees for the race to kick into action. "The bad thing about TUEs at the moment is that if you've had a TUE, that's seen as a negative thing - but it's not".
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But City were pegged back within six minutes after Mohamed Salah came off the bench and equalised, before Mane converted a spot-kick at the death.