Florian Wirtz is one of the main reasons why Bayer Leverkusen are on a season-long unbeaten run and closing in on a German league and cup double, with a treble also possible via the Europa League. The 20-year-old attacking midfielder was once again the centre of attention in Wednesday’s 4-0 triumph over Fortuna Düsseldorf for a place in the German Cup final. German international Wirtz set up the temporary second from Amine Adli before scoring his first career brace, including a first penalty, for the final score in his 141st Leverkusen match. Team-mates and beaten opponents heaped praise on Wi…