Nishikori needed six match points to seal the win in two hours at the ATP Masters event held behind closed doors at the Foro Italico.
Internacional lead Group E, three points ahead of second-placed Gremio, who lost 2-0 at Universidad Catolica in Chilean capital Santiago.
The final decision on the public's return will rest with the Ministry of Public Health, Lacalle Pou said, emphasizing that the conduct of Uruguayans will help decide if stadiums will be reopened to fans.
Despite Thursday's result, Flamengo are second in their Libertadores group with six points from three matches but with a negative goal difference. The Rubronegro remained in Ecuador after the clash in Quito to prepare for Tuesday's fixture against Barcelona SC in the Pacific port city of Guayaquil.
Alcantara will be only Liverpool's second signing of the summer after the arrival of left-back Kostas Tsimikas, who will provide backup to Andy Robertson, even though other sides, such as Liverpool's weekend rivals Chelsea, have been more active in the transfer market.
Just three minutes into the second half, Hamdallah doubled his team's lead and his own tally after tapping in a rebound that fell to him just outside the six yard box, after a magnificent solo run down the right by Khalid Al-Ghannam ended with his initial shot being deflected into the Moroccan's path.
Tour rookie Zhao also collected five points from two draws and one win. However, the 17-year-old lost one more frame than Zhou in total.
Villarreal coach Unai Emery will be looking for more cohesion in attack and his side will be favorites against Eibar, whose first game of the season was a dull 0-0 draw with Celta Vigo.
"We are in CAF already because our names have been taken there. Even if you are going by last year's records, if you nullify the league, last year's champions represent the country, which is ourselves," said Rachier.
Capped seven times for Brazil's national team, Neves has also had spells with Fluminense, Flamengo and Germany's Hamburg over a career spanning more than 15 years.
With the domestic 2020/2021 campaign set to start on this Friday evening, none of the 17 challengers seems to have found a convincing answer yet.