Spain vs IranDiego Costa scored a second-half winner to help Spain edge past doughty Iran 1-0 in a key Group B FIFA World Cup 2018 game here on Wednesday.After a barren first-half where Spain were left frustrated as Iran defended brilliantly, Costa (54th) broke the deadlock albeit in fortuitous circumstances. Costa's shot ricocheted off a defender to beat goalkeeper Alireza Beiranvand.