Fritz was followed by Madison Keys, who defeated Magda Linette 6-4, 6-2. Fritz and Pegula then completed a 5-0 sweep by defeating Lukasz Kubot and Alicja Rosolska in mixed doubles, 6-7(5), 6-4, 10-6. The US team is now 4-0 in mixed doubles in the United Cup.
Djokovic passed a stern semis test, defeating the American by 7-6(5), 7-6(6). He is now just one win away from equalling Swiss legend Roger Federer's record of six titles at the prestigious event that concludes the season
Fritz shot 32 winners and overpowered Auger-Aliassime during the heavy-hitting exchanges in the third set, earning the crucial break at 3-2 in the decider set to cruise after two hours and 44 minutes long battle.
The third seed clinched a 6-3, 4-6, 7-6(6) win over the American to confirm his progression from Green Group. Coming into the match after a win over Canada's Felix Auger-Aliassime, Ruud managed to hold his calm to clinch the semifinal spot after a tense battle of two-hours and 12 minutes
Fritz completed a dream debut at the season finale while smashing Nadal's bid to win the lone big title that has eluded him in his legendary career with a 7-6(3), 6-1 victory.
In the second half of the season, Nadal lost his ATP Tour rhythm for good and bad reasons. Aside from missing time to recover from two abdominal tears, he sustained at Wimbledon and right before the US Open, he welcomed the birth of his first child in October.
The current world number 1 Carlos Alcaraz of Spain will be missing the tournament due to an injury. This will leave Nadal, Djokovic, Stefanos Tsitsipas, Casper Ruud, Daniil Medvedev, Felix Auger-Aliassime, Andrey Rublev and Taylor Fritz fighting for the singles title