The last official tournament of the season, for Federer, was the ATP Finals in London. As the No. 3 seed, he was drawn in the group Björn Borg along with Novak Djokovic, Dominic Thiem and Matteo Berrettini. His first match was a straight-set loss to Thiem, followed by a victory in straight sets against Berretini to keep him alive in the group standings. His last group match was a straight-set win against Djokovic, his first victory against him since the 2015 edition of the tournament. Therefore, he finished the group in second place and advanced to the semifinals. There, he lost in straight sets to Stefanos Tsitsipas, in the match that officially ended his season.