Social Democratic Party (SPD) Peer Steinbrueck (2nd L) arrived at a studio hosting the TV debate of chancellor candidates in Berlin, Germany, Sept. 1, 2013. German Chancellor Angela Merkel faces off her opposition challenger Peer Steinbrueck on Sunday night in their only TV debate before the Sept. 22 general election as polls have been suggesting Merkel will win a third term. (Xinhua/Zhang Fan)