Freiburg coach Christian Streich says last season’s runners-up will have to remain calm at Kaiserslautern in their German Cup first round game on Sunday, with the opposition fans looking for a big scalp. Freiburg lost to RB Leipzig in the final last season and are desperate to win a first major honour this term. “They want to pull off a real surprise and knock us out, every fan will be involved in that,” Streich told reporters on Friday. “We have to stay cool, but not too cool.” Former Bundesliga mainstays Kaiserslautern were promoted back to the second tier from the third division last season…