Nadal has only played four matches this year, two for Spain in the inaugural United Cup and two at the Australian Open, where he lost in the second round to Mackenzie McDonald.
American Jessica Pegula, a member of the WTA player council member reiterated Swiatek's remarks. She cited the mixed team competition known as the United Cup from earlier in the season as a means of doing that
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.
After a day of gruelling competition in which the four singles matches could not determine the winner, the Greek pair's 7-6(6), 6-4 win gave their country a 3-2 victory.
The tie hung by the thread but the Polish pair prevailed over their Italian counterparts in straight sets to claim the victory. They won by 6-1, 6-2 in the crucial match.
The USA will complete Group C unbeaten after having defeated the Czech Republic in their opening tie as they move on to the City Finals to face Great Britain.
Berrettini got the better of World No 3 in a much-anticipated match, winning it 6-4, 6-4 in straight sets to seal Italy's victory over Norway and take a commanding 3-0 lead. The Italian team will face either Poland or Switzerland in the City Finals on Wednesday.