Thirty-seven club trophies, seven Ballon D'Or awards and six European Golden Boots. A Copa America title, an Olympic gold medal and a list of scoring and statistical records that may never be beaten. Over the course of an 18-year career Lionel Messi has, with one obvious exception, won the lot. And won it again and again. On Sunday, the 35-year-old Argentina captain has the chance to fill the last remaining hole on his CV: a World Cup winners' medal.