A stoppage time goal by substitute Ahmed Hassan gave Olympiakos Piraeus a 1-0 win over 1993 European Cup winner Olympique Marseille in its Champions League Group C match on Wednesday. Hassan, who came on for Giorgos Masouras in the 84th minute, headed home an inch-perfect cross by former Marseille forward Mathieu Valbuena after a dominant Olympiakos had missed a string …