The top flight side started an onslaught on Chemnitz's goal and they got rewarded in the 111th minute when Kramaric wrapped up his brace after keeping his nerves from the penalty spot to ensure the shootout.
Alves almost added his second in the 61st minute, but his powerful shot was denied by the crossbar.
The 30-year-old came off the bench in the 67th minute and rifled home a low 35-yard free-kick in stoppage time as the hosts secured a barely-deserved point at their Vila Belmiro stadium.
Duisburg tried to keep pace but the "BVB" continued their relentless march, as Giovanni Reyna's deflected free-kick left goalkeeper Leo Weinkauf helpless five minutes into the second half.
Celta were even closer to the drop than Eibar and have waved goodbye to important loanees Rafinha and Jeison Murillo, while Fiodor Smolov and Pione Sisto have also left.
Adi Hutter's men gained momentum and sealed the deal five minutes later after Silva set up for Dost, who netted the 2-0 lead with a header from close range.
Hertha tried to respond but for all that Braunschweig doubled their advantage through Maximilian Mittelstadt, who deflected a header into his own goal with 17 minutes gone.
In other matches, Guizhou Hengfeng drew 1-1 with Zhejiang Energy Greentown, and Changchun Yatai edged Heilongjiang Lava Spring 2-1.
His absence is likely to provide another opportunity for Cesar Dutra, who replaced Alves in the team's 2-0 defeat to Ceara in Brazil's Serie A championship on Sunday.
After the game, Suning sit second with 19 points, while R&F rank third to the bottom with 11. Enditem
"In the end all I focus on is what I can control on the tennis court. That's what I did in 2018 final. I feel like that's what I did this time," said the 22-year-old Osaka, who defeated Serena Williams of the United States to win the 2018 title.