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The world No. 3 is back swinging a racquet after recent elbow surgery.

After cutting his Asian Swing short due to injury, the Aussie is back and winning. 

Roger Federer, as he so often is, was voted the winner of the most awards. 

The Greek player won the biggest title of his career at the ATP Finals.

From upsets to hot shots to off-court shenanigans, a lot happened in London.

Among those in attendance included David Ferrer, Marcos Baghdatis and Radek Stepanek.

Stefanos Tsitsipas and Dominic Thiem will square off in a clash of one-handed backhands.

Tsitsipas and Thiem will each seek their biggest career title at the ATP Finals on Sunday.

The final teams in are headlined by a mix of established contenders and rising stars. 

Rafa was honored in London, before being eliminated from the event by the defending champ.

The Swiss dismissed the world No. 2 to make his way into the London semifinals.

The 2010 Wimbledon finalist will officially bid adieu at the ATP Finals on Saturday.

Federer and Djokovic will meet in a winner-take-all clash after Tuesday's mixed results.

From selfies with Roger and high-fiving a fan, the Greek player had tasks in London.