Giustino beat Moutet 0-6, 7-6(7), 7-6(3), 2-6, 18-16 as the deciding set alone lasted three hours.
Registered runners will now have the choice to defer their registration into next year's event or receive a refund of their entry fee.
Meanwhile left back Marcelo is also struggling with a back injury and Ferland Mendy will continue in defense.
The victory ended a tumultuous two-week period for Flamengo. Following the defeat in Quito, the Rio outfit reported 16 COVID-19 cases in their squad, leaving them with only three regular first-team players for their Brazilian Serie A visit to Palmeiras last Sunday, which ended in a 1-1 draw.
Although new signing Luis Suarez started for Atletico and showed some neat touches with Joao Felix, Huesca held Diego Simeone's side at bay despite some nervous moments mainly produced by the impressive Joao Felix, who shows signs of maturing into La Liga.
In the other game in the Chengdu division, after a goalless first half, Taizhou Yuanda broke the deadlock in the 54th minute to claim a 1-0 victory against Beijing Renhe, and Beijing BSU defeated Suzhou Dongwu 3-2.
The ITTF has voted for holding an Extraordinary General Meeting (EGM) during the World Team Table Tennis Championships in Busan, South Korea, which has been rescheduled to take place in 2021 due to the COVID-19 pandemic, while the AGM is planned to be held towards the end of 2021 to serve as an opportunity to review the progress of the year. Enditem
To find new faces seems to be much more vital than to beat Dortmund and win this season's fifth title. Enditem
Fujian's form faded suddenly in the middle of the third set as Shanghai staged a 9-0 scoring run, including three points from serving. Shanghai then kept the huge lead until the set ended.
Brazil has the world's second-highest COVID-19 death toll behind the United States, with more than 141,000 fatalities. Enditem
Selby, 37, reached his 27th career ranking final after defeating China's top player Ding Junhui and compatriot Shaun Murphy back-to-back on Saturday.