Tsitsipas was edged by Stan Wawrinka in a marathon over-fiver-hour battle at this stage last year, but this time he took chances with his 24 winners against the No.18 seed.
Xinjiang began to take charge of the game back from the locker room on the way to a 19-point advantage after the third quarter.
"She played really really well today. I think everything is tough. My ball is very short and she opened the court very nice and used very nice winners," said the world 39th-ranked Zhang, who has also achieved a personal best at Roland Garros by reaching the fourth round.
The 30-year-old, who has been capped once for Argentina's national team, has struggled for opportunities since joining Boca from Mexico's Cruz Azul in January 2019.
The visitors from the capital started well, and disrupted Bayern's build-up work in the early stages.
Real Betis won 2-0 away at Valencia. Sergio Canales celebrated his return to the Spanish national team squad by opening the scoring following magnificent control and shot in the 19th minute and Cristian Tello scored Betis' second of the game with 16 minutes remaining. Enditem
Wuhan had the upper hand for most of a back-and-forth second half, heading into the final frame with a three-point margin, but had to watch as their lead slipped away.
Elsewhere, Sassuolo registered another comprehensive victory as it beat Crotone 4-1 with Francesco Caputo's brace.
Alba's natural replacement in the Barca squad, Junior Firpo, is also injured at the moment, although he is expected to be able to return to training in the coming days. Enditem
Iran sit third, behind Iraq and Bahrain, in Group C of the Asian qualifiers for the FIFA World Cup Qatar 2022. Enditem
"I'm very, very happy to be in the semifinals again and here at Roland Garros," Nadal said on court. "No doubt that this is the most important place for me and the most beautiful place to play."