USA have claimed their first win in a Rugby Sevens World Series event after beating Australia in the cup final at this weekend's season-ending tournament in London.

Danny Barrett and Maka Unufe scored two tries apiece as the American side, who beat England on their way to the final, thrashed Australia 45-22, leaving their opponents without a cup win this season.

England's loss to the USA meant that the host country went into the third-place playoff against Fiji, but they were well-beaten 26-12.

Fiji knew that reaching the last four secured them the 2014-15 Rugby Sevens title, but Semi Kunatani and Osea Kolinisau both found the try line to ensure that the champions finished the season on a high.

Fiji beat nearest rivals South Africa in the quarter-finals to secure the title, leaving the Blitzboks to face off against New Zealand in the plate final.

Seabelo Senatla, the top try-scorer in this year's event, added two more to his total to finish the campaign with 39, but it wasn't enough to prevent New Zealand from cruising to a 26-14 win over the Commonwealth champions to lift the plate.

In the bowl final, Collins Injera led Kenya to a comfortable win over Argentina, having scored his 200th try in the semi-final win over Japan earlier in the day.

Billy Odhiambo and Dennis Ombachi were also among the points as Los Pumas slipped to a 26-12 defeat, while Injera finished the day with four tries.

Meanwhile, Japan's exit in the bowl left them to fight it out with France in the shield final, where they secured their first piece of silverware this season.

France appeared to be heading for a comfortable win as they opened up a 19-0 lead, but Yoshikazu Fujita, Lote Tuqiri and Lomano Lemeki led the Japanese comeback as they clinched a 21-19 victory.