The last set became a lop-sided affair for Tianjin, which went on a 12-4 run to pull away and kept the advantage until the end.
In another game on Sunday, Beijing moved past Daqing 87-50. Enditem
Koeman's team looks faster, fitter and hungrier, with Philippe Coutinho getting involved and Leo Messi smiling again. There is a question mark over the lack of central defenders and with Clement Lenglet suspended against Sevilla on Sunday that looks to be their main weakness.
Slovan Bratislava was looking for its first triumph of the season on home ice, but a meager 22 shots and a single goal scored were not going to cut it.
Clubs like Bayern had to accept a substantial loss in quality after the departures of Thiago Alcantara (Liverpool), Philippe Coutinho (back to Barcelona), and Ivan Perisic (Inter).
The estimated timing for the start of training camp will be announced at a later date.
Saturday ended with Newcastle United winning 3-1 at home over Burnley thanks to an excellent display from winger Allan Saint-Maximin and two goals from Callum Wilson. Enditem
"I need to shoulder more responsibilities," said Guo, who joined Hebei during the offseason.
After pocketing the second win consecutively since the beginning of the season, Shanxi coach Li Ge gave a high appraisal of some of his veterans' performance.
The "Eisernen" made a perfect start on home soil as Christopher Lenz tested Mainz goalkeeper Robin Zentner in the early stages, before Max Kruse nodded home his debut goal after Sheraldo Becker's pinpoint cross to the far post in the 13th minute.
On the Hebei side, Guo bagged a team-high 19 points. Ma Wen and Zhang Yaqi scored 13 and 12 points respectively.