Germany reaches Confed Cup semis amid more replay confusion
Germany extended its lead two minutes after the red card courtesy of a diving header from Timo Werner.
By securing top spot in Group B of the World Cup warm-up tournament, the inexperienced Germany squad playing without many of its 2014 World Cup winners will now stay in the Black Sea resort of Sochi and play Mexico on Thursday.
Loew's side was wasteful, with wing back Joshua Kimmich sending a diving header wide, and largely restricted to attacking down the flanks.
Julian Draxler fed Demirbay with a back-heel through Siani's legs and the midfielder marked his first international start by slicing a shot into the top corner with his weaker right foot.
The striker whose goals propelled Leipzig to a surprise second-place finish in the Bundesliga turned a cutback from Benjamin Henrichs into the net to ensure Cameroon leaves Russia early.

