Giustino beat Moutet 0-6, 7-6(7), 7-6(3), 2-6, 18-16 as the deciding set alone lasted three hours.
With the result, Augsburg have won their first two Bundesliga games of the campaign for the first time in the club's history, while Dortmund suffered their first loss of the season.
1 Fati ready to become new Barca hero
Last season's WCBA league saw an earlier conclusion than originally scheduled due to the COVID-19 pandemic, and Thursday's first round matches ended a nine-month WCBA drought.
MADRID, Sept. 30 (Xinhua) -- Real Madrid winger Eden Hazard has suffered another muscle injury and is unlikely to play for the club before the middle of October.
"Never give up. It's a good day. It's nice to get another win as it's been a while and I now need to keep the momentum going," added the Finn, who has generally struggled to match Hamilton's pace this year.
"We have been plagued with injuries during the first stage but grappled with reality," Said Shenhua coach Choi Kang-Hee. "We'll do our best next round."
Tianjin once had a good chance to break the deadlock in the 56th minute when midfielder Che Shiwei was fouled by defender Cong Zhen in the penalty area. After a VAR check, the referee awarded Tianjin a penalty kick, but Ghana's striker Frank Acheampong failed to convert it to a goal.
Dortmund continued on the front foot and controlled possession but Augsburg's well-positioned defense defused most attacks in the midfield.
Sunday's last game saw Jarod Bowen score twice as West Ham claimed their first points with a 4-0 win at home to a lackluster Wolverhampton Wanderers. Wolves' striker Raul Jimenez scored a 66th minute own goal and Sebastian Haller bagged the fourth in injury time.
Comments of team leaders indicate growing unrest in a squad that seems to fear their ambitions could be disappointed when trying to repeat some of last season's success after winning the treble.