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WATCH: ATP Finalists go on Underground adventure in London

By Cody Fitzpatrick

The ATP Finals crew had quite the day on the London Underground, on Friday, heading to the Houses of Parliament for the tournament's launch party.

Lots of fun was had by all, although Dominic Thiem did have a little trouble getting through the turnstile.

Things improved, though, when he got control of the "THIEM-CAM," which he used to poke fun at Alexander Zverev's no-socks fashion statement.

And Roger Federer remained as charming as ever:

Of course, they also had to take a group selfie, which Kei Nishikori had the honor of snapping.

In the first singles match at the O2 Arena, Kevin Anderson, in his ATP Finals debut, defeated Thiem 6-3, 7-6 (10). Sunday's second singles match saw Nishikori upset Federer in straight sets.

2018 ATP Finals: K.Anderson vs D.Thiem Round Robin Match Highlights

This Week on Tennis Channel:

ATP Finals (Sun - Sun 11.11 - 11.18) - Novak Djokovic, Roger Federer and the world's best collide in the season Finale. Live coverage begins on Tennis Channel Sunday at 7:00am EST.