"She played unbelievable today and she was everywhere and she hit all the balls in a very strong, very powerful way," the world No.2 said after the match. "It was a little bit cold and I couldn't be at my best."
"The tiebreak was very tense. The tiebreak was where all the money was," said Tsitsipas on court. "I am glad that I played good tennis and I didn't panic. I stayed concentrated, stayed low-key and tried to take it point by point."
The match will be Iran's first game at the national level under the leadership of Dragan Skocic.
Argentina will host Ecuador at La Bombonera in Buenos Aires on October 8 before a clash with Bolivia in La Paz five days later.
Jiangsu took to attacking the basket from the paint early on, before going up 20-9 on a 14-0 surge.
Atletico Madrid at home to Villarreal is Saturday's most attractive game, with Luis Suarez likely to start in the Wanda Metropolitano as Atletico looks to improve on its flat showing away to Huesca in midweek.
"I'm sure that I can make many layups on the university basketball court, but here, when opponents inflicted huge pressure on me, my chance of doing that will be much lower."
Jiangsu showed its well-balanced, attacking firepower, with seven players scoring in double figures, led by Sun Li's 18.
Sevilla opened the scoring in the 7th minute when Luuk de Jong fired home with his left foot after Barca failed to deal with a corner, but Barca levelled barely a minute later when Jesus Navas was unable to clear Jordi Alba's ball into the area, allowing Coutinho to pick his spot.
In the match between Jiangsu Suning and Beijing BG Development, Zhai Qingwei's long-range shot in the 29th minute helped Jiangsu defeat Beijing 1-0.
Farias will be without key names from Bolivar and Jorge Wilstermann after officials from both clubs asked that their players be released from national duty to concentrate on the Copa Libertadores, South America's top club competition.