John Millman found a way to tour the beautiful city of Stockholm while not tiring himself out before match day. He opted for an electric bike to zip around the streets.

"It's so nice to be able to see and experience Stockholm in a slightly different fashion," the 29-year-old Australian said. "It's a beautiful city."

The world No. 33 made a big name for himself when he stunned Roger Federer in the fourth round of the US Open. Since that breakthrough he's played just one event, a first-round loss in Shanghai.

On Tuesday, Millman opened his Stockholm campaign with a three-set win over qualifier Alexei Popyrin.

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He plays third seed Stefanos Tsitsipas next.