Pakhtakor goalkeeper Suyonov was sent off in the 65th minute and Sanzar Kuvvatov was brought on to take his place. But almost instantly, the Uzbek side rallied at the other end of the pitch and replied with a goal, as substitute striker Eren Derdiyok blasted in the rebound after Dragan Ceran's initial effort was saved.
"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.
But Bahabri gave his side all three points after his long-range effort was deflected into the net in the final minute of stoppage time.
Fans can't wait for Erling Haaland, Jude Bellingham, Jadon Sancho, Real loanee Reinier, Giovanni Reyna and wonderboy Youssoufa Moukoko to get the engine running at full speed.
The trial will run until the end of October. The situation will then be reevaluated in six weeks.
With Li Shenglong's header in the 75th minute, Shanghai SIPG beat Chongqing Lifan 3-2.
Bellingham, Reyna, Brazilian Reinier, the young superstars Jadon Sancho and goal-monster Erling Haaland (both 20), wonderboy Youssoufa Moukoko (15) all offer pace and fearlessness.
Serginho then turned from hero to villain when he received a second yellow card for scything down Carlos Eduardo two minutes from time.
"We had more rest time than other teams. This will benefit us for the match against Al Shorta," Namjoo Motlagh was quoted as saying.
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.
Earlier, Xiao opened his account by beating Farakh Ajaib 3-1 before drawing 2-2 with Jak Jones.