Dortmund responded with furious attacks but Gikiewicz was alert enough to keep out promising chances from Thomas Meunier and Erling Haaland before the break.
The only down side for the capital-based team was that Renato Augusto limped off with an injury and the Brazilian is suspected of suffering a muscular problem.
Omar Al Soma (R, front) of Al Ahli Saudi FC vies with Farshid Esmaeili(L, front) of Esteghlal FC during the AFC Asian Champions League group A football match between Esteghlal FC of Iran and Al Ahli Saudi FC of Saudi Arabia in Doha, capital of Qatar, Sept. 23, 2020. (Photo by Nikku/Xinhua)
Opponent Real Betis has started the campaign well under Manuel Pellegrini and the former Real Madrid coach looks to have added steel to a side which flattered to deceive last season.
The result at the Beira-Rio stadium meant Gremio jumped to second in the group's standings, equal on points with Internacional but with an inferior goal difference.
The only disappointment for Graham Potter's side was a late red card for Yves Bissouma.
If head coach Domenec Torrent didn't have enough obstacles to overcome, an eruption of ash from the Sangay volcano left his team unable to train on Sunday.
The Guinness Book of World Records has also recognized him as the first person to climb Mt. Qomolangma in winter without bottled oxygen in December 1987.
The remaining eight teams of the league will form the other group, to be based in Dalian, to fight off relegation, with the last to be relegated and the second to last set to vie for a berth for the next CSL season with the winner of the second-tier league. Enditem
Suzhou pulled one back in the 60th minute with an accurate cross from midfielder Li Haowen, assisting forward Tang Chuang to score an open goal.
The 38-year-old broke the deadlock in the 34th minute as Theo Hernandez whipped in a cross from the left and the Swede out-jumped two defenders to steer his powering header into the net.