Summer signing Serhou Guirassy once again proved himself to be a saviour in times of need as he scored a goal in the 83rd minute to secure Borussia Dortmund a much-needed 2-1 win against St Pauli Hamburg on Friday evening. Against Bochum on September 27, Guirassy had already showed his value as he scored twice to help Dortmund claim a 4-2 victory after being 2-0 down. “He’s super professional. An absolute professional who is used to performing every three days,” Dortmund sporting director Sebastian Kehl praised. Dortmund have had their worst start to a season in 10 years and before the interna…