Mikel Merino was Spain’s difference-maker as the Arsenal star scored two headed goals to fire La Roja to an emphatic 4-0 World Cup qualifying win over Bulgaria at the Estadio Municipal Jose Zorrilla. Debutant Atanas Chernev put through his own net to all but secure the result, before Mikel Oyarzabal struck home a stoppage-time penalty to round off the scoring. The result edges Spain closer to history, marking their 29th competitive game unbeaten – equalling the record of their world champion generation.