On paper, the Real Madrid squad doesn't look much stronger ahead of the new campaign than it did at the end of the last one, and any major arrivals appear unlikely. However, the summer chaos at FC Barcelona and the fact that Atletico Madrid haven't made any signings either implies that merely by standing still, Real could open up a gap.
Elsewhere, Canadian rising star Denis Shapovalov stunned seventh seed David Goffin of Belgium 6-7 (0), 6-3, 6-4, 6-3 to make last eight, while Croatia's Borna Coric also advanced.
Zhou Junchen (C) of Qingdao Huanghai shoots during the 9th round match between Qingdao Huanghai and Shijiazhuang Ever Bright at the postponed 2020 season Chinese Football Association Super League (CSL) Suzhou Division in Suzhou, east China's Jiangsu Province, Sept. 5, 2020. (Xinhua/Yang Lei)
With reigning US Open champion Nadal, who cited concerns about traveling amid the COVID-19 pandemic, and an injury-hit Federer opting out of the event, Djokovic had been favorite to win another title in New York. Enditem
Quintero represented River Plate 61 times and scored 12 goals after his arrival from Independiente Medellin in 2017.
Liu was victorious in the 2019 Women's World Cup, defeating 2017 winner Zhu in last year's final.
In Group B2's other match, Scotland won 2-1 against the Czech Republic, who had had to call up an entirely new squad for the match owing to COVID-19 quarantine regulations.
Mena struck in the 41st and 51st minutes at Estadio Victoria as the visitors secured their fifth win from eight matches.
Indeed, before the enforced break due to the coronavirus, Atletico were in sixth place in the table and it looked as if a top-four spot and qualification for the Champions League were in doubt.
Kenya which currently has laws to criminalize doping in the country, has been embroiled in doping scandals involving its top runners.
Samir Memisevic (C) of Hebei China Fortune competes during the 9th round match between Hebei China Fortune and Shanghai SIPG at the postponed 2020 season Chinese Football Association Super League (CSL) Suzhou Division in Suzhou, east China's Jiangsu Province, Sept. 5, 2020. (Xinhua/Li Bo)