Manchester City's Roberto Mancini claims he's 'best manager in England' and Sergio Aguero key to title hopes "Someone says for six months that Manchester City would change manager, Guardiola would come in, and after Guardiola went to Bayern Munich, now another manager," he said. I won one Premier League, one FA Cup, one charity shield, there is not another manager that's won like me in the last 15 months. I can do nothing but it is the reality. Mancini also said that Sergio Aguero, who scored twice against Leeds, could hold the key to City's hopes of clawing their way back in the title race. City overcame an eight-point deficit last season to pip United to the title, and Mancini has not written off another great recovery. "I hope Sergio will be like this until the end of the season," said Mancini. If Sergio is like this and our strikers continue to score a lot of goals from now until the end, the championship is not finished.