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.
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.
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.
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.
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.
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.