Arminia Bielefeld captain Mael Corboz said his team's recent struggles have hardened their self-belief after the third-tier side beat holders Bayer Leverkusen 2-1 on Tuesday to reach their first German Cup final following a relegation battle last season. Bielefeld have sent four Bundesliga teams spinning out of the competition in consecutive rounds to become the fourth third-tier side to reach the final. Visitors Leverkusen led in the 17th minute through Jonathan Tah but Marius Woerl equalised