On the back of a three-day event in Paris which Samoa won 29-26 in a final against Fiji, this week’s tournament takes place at Twickenham.
Samoa head Pool A and face three tough games against the series’ second-placed side South Africa and north American rivals USA and Canada.
After impressing in front of their crowd in Paris, France start at Twickenham with matches against Kenya, Scotland and Portugal in Pool C.
And finally Argentina head Pool D and will play group stage matches against New Zealand, an improving Russia side and Olympic hosts Brazil.
London Sevens Pools
Pool A: Samoa, South Africa, USA, Canada
Pool B: Fiji, Australia, England, Wales
Pool C: France, Kenya, Scotland, Portugal
Pool D: Argentina, New Zealand, Russia, Brazil