On January 3, the United Cup ended a new round of competition, Djokovic was challenged, narrowly defeated the Czech Republic's Leheczka 2-1, Serbia finally reversed the Czech Republic 2-1, and finally beat the Chinese team to rank first in the group, and qualified together with the Chinese team. At this point, the quarterfinals are out, Serbia will compete with Australia for a place in the top four, and the Chinese team will compete with Poland for a place in the top four.
The Serbian team has obvious hard injuries, and the women's singles are weak. Against the Czech Republic, as expected, the Czech team's Grand Slam champion Vondrousova won 2-1 Danilovic to get the first point for the Czech team. In the second Men's Singles match, Novak Djokovic was challenged to beat Leheczka 6-1, 6-7, 6-1 to equalise for Serbia.
In the third mixed doubles match, because the first two matches were played in three sets, the main players of the two teams, Djokovic and Vondrousova, were all suspended. Djokovic opted for a break and was replaced by Mejdovic. Mejdovic/Danilovic take on Czech Republic's Koloziejova/Noza. It was a very good match, with Mejdovic/Danilovic losing the first set 4-6 and the second set equalising through a tie-break. In the tie-break, Mejdovic/Danilovic won 10-8 to help Serbia win.
After winning this game, Serbia won 2 consecutive victories to lock up the first place in the group and advance strongly. The Chinese team finished second in the group and qualified together with the best second. At this point, the top eight are the fourth.
In the quarterfinals, Serbia played against Australia, and China played against Poland. In the match between Serbia and Australia, Serbia has an obvious advantage in men's singles, and the strength of women's singles is relatively close. Because Australia's mixed doubles is very strong.
The match between China and Poland will be very difficult. In the match between Zheng Qinwen and Swiatek, there is still a gap in the strength of the two, and the chance of winning is very small. Zhang Zhizhen and Hurkacz have a big match, and they have won and lost each other. The key to this match is the men's singles, if the men's singles loses, China is likely to be out. If Zhang Zhizhen wins, the mixed doubles is likely to be inferior to the opponent.