Forward Serginho restored Jorge Wilstermann's advantage with a 56th-minute strike but Alves pulled his team level again with a smart finish after combining with Fabio Luciano.
Xiao, world number 31, turned pro in 2007 after winning the Asian U21 Championship. His best ranking performances were runner-up finishes at the 2013 Shanghai Masters and the 2017 Shoot Out.
Guoan went ahead before the interval as Cedric Bakambu headed home a cross from Augusto. Substitute Alan Douglas scored in the 88th minute to extended Guoan's lead to 3-1, but Hebei's Zhang Chengdong sparked the game into suspense with a powerful shot in the second minute of stoppage.
The Spanish press reported on Saturday that the Welsh international is carrying an injury that sidelined him for a month, but Bale made no reference to that in his first interview.
Roma's Lorenzo Pellegrini (R) vies with Hellas Verona's Davide Faraoni during a Serie A soccer match between Hellas Verona and Roma in Verona, Italy, Sept. 19, 2020. (Photo by Alberto Lingria/Xinhua)
20 minutes later, Jaroslav Zeleny got lucky and his shot from the top of the box bounced off a teammate and into Dunajska Streda's net to tie things up for the visitors 1-1.
Top seeds Novak Djokovic and defending champion Rafael Nadal, who have first round byes, will begin their campaigns on Wednesday.
The seven-time German Champions (last in 1958) and five-time cup winners (last in 2011) boasts one of Europe's most successful academies.
"In the future, we will help more students fulfill their dreams in sports," said the school headmaster Ren Junxin. Enditem
"There was a period where there was an easy answer to what team is the best in the world. Now, that answer is no longer so easy, with Russia able to make a convincing argument, and Germany not far behind," the FIVB's website reported on Tuesday.
Ge Manqi dominated in the women's 100m race with a 11.35s, Yang Huizhen and Guo Zhongze won the women and men's 400m respectively. Hu Zhiying and Liang Qi claimed victories in the women and men's 1500m. Wu Yanni won the women's 100m hurdles, while Ma Qun was the winner of the men's javelin. Enditem