The 2015 and 2016 champions took the lead against a youthful Japanese side after 42 minutes thanks to a towering header from midfielder Erick Pulgar.
Veteran striker Eduardo Vargas then scored in a fourth consecutive major tournament by doubling Chile’s lead in the 54th minute.
Alexis made it 3-0 with a diving header from close range in the 82nd minute and our no.7 punched the air in celebration afterwards. It was his first goal in all competitions for club and country, since his strike against former side Arsenal in the Emirates FA Cup fourth round back in January.