 Unlike all other series events, the 2013 London Sevens had only 12 teams competing for series points, namely the top 12 core teams on the season points table following the season's penultimate tournament, the Scotland Sevens.The Core Team Qualifier involved eight teams—the winner of the HSBC Asian Sevens Series; four teams advancing from the World Series Pre-Qualifier, held as part of the Hong Kong Sevens; and the three core teams at the bottom of the season table after the Scotland Sevens.The top three teams at the end of the Core Team Qualifier became core teams for the next season.