Bayer Leverkusen remain on course towards going unbeaten through a full football season but still face some difficult tasks en route to what would be an extraordinary feat. Leverkusen have already clinched a first-ever Bundesliga title, are big favourites in the German Cup final against second division Kaiserslautern, and are in the Europa League semi-finals where they will face Roma like last. Jeremie Frimpong’s late 1-1 equalizer at West Ham United on Thursday night extended Leverkusen’s unbeaten season run to 44 matches, a record in Europe’s top five leagues as they moved one ahead of Italy…