Elsewhere, Freiburg and Wolfsburg shared the spoils following a 1-1 stalemate as Josip Brekalo cancelled out Nils Petersen's opener. Enditem
"I really wanted to give an effort here. It's my Achilles that didn't have enough to properly heal after the Open. I was able to get it somewhat better, but just looking long-term in this tournament, will I be able to get through enough matches? For me, I don't think I could," said the three-time Roland Garros winner.
Giustino beat Moutet 0-6, 7-6(7), 7-6(3), 2-6, 18-16 as the deciding set alone lasted three hours.
Midfielder Unai Lopez scored twice as Athletic Club Bilbao won 2-1 away to Eibar.
With the score tied at 68-all before the final quarter, Sichuan took charge of the last 10 minutes despite Shao's departure.
Roberto Lopez sealed the win in the 94th minute with a powerful shot into the corner after another assist from the impressive Merino.
Several of those who tested positive for the virus have since recovered and Flamengo were able to begin Wednesday's match with seven of their usual starters.
The next stage will begin with a two-legged knockout round from October 16. Enditem
Also on Monday, Hebei China Fortune beat Qingdao Huanghai 3-1, so Hebei will face Guangzhou Evergrande in the next stage.
Following reigning world champion Liu Shiwen's withdrawal due to an injury, her compatriot and current world No. 1 Chen Meng enters the action and expects a tough challenge from the closest rival Mima Ito from Japan.
Zhang was 0.45 second faster than the former Asian record holder, Olympic champion Liu Zige, who has kept it for 11 years. There is only a 0.14-second difference between Zhang's new record and the world record held by Swedish Sarah Sjostrom.