Saturday saw two players advance to the ATP Finals for the first time, while a doubles team owning a Career Grand Slam continued to dominate in London. Here are the Top 5 photos from the exciting day of action.

1

Stefanos Tsitsipas is seen waving in three locations following his 6-3, 6-4 victory over Roger Federer. The 21-year-old will contest the biggest final of his career on Sunday.

2

Federer exits the court after making his 16th appearance in the semifinal stage of the season finale. The Swiss went just 1 for 12 on his break point chances in defeat.

3

The Davis Cup Finals hosted a welcome dinner for the competing nations in Madrid. Here, Kyle Edmund leads a group selfie with his British teammates.

4

Dominic Thiem embraces friend Alexander Zverev after dashing the German's hopes of repeating as champion at The O2. The Austrian prevailed, 7-5, 6-3, saving all four break points he faced. 

5

Nicolas Mahut and Pierre-Hugues Herbert celebrate reaching the doubles championship for the second year in a row at the ATP Finals, after defeating Lukasz Kubot and Marcelo Melo, 6-3, 7-6 (4). The Frenchmen have not dropped a set in four wins thus far.