 Complete the following phrase:  The 201213 Borussia Dortmund season started on 18 August 2012 with a win against FC Oberneuland. Borussia Dortmund qualified for the 201213 UEFA Champions League and were scheduled against Ajax, Manchester City and Real Madrid. The clubs opening league match was against Werder Bremen on 25 August and their opening Champions League match was against Ajax on 18 September. Hamburger SV end the clubs 31-match unbeaten streak on 22 September. On 30 April, Borussia Dortmund qualified for the 