Canada v Australia face-off: 15:00 BST
Canada comprehensively beat New Zealand 16-1 in the quarter-finals while Australia thumped Scotland 21-6.
USA v England face-off: 18:00 BST
USA reached the semi-finals with ease, beating Israel 20-3. England had a more competitive quarter-final, defeating Wales 9-5.
You can catch up on the action from the USA's and England's wins here.