irbsevens.com and James Mortimer 02.Feb.2013Getty Images
Having trailed 14-0, Mike Friday's side scored two second-half tries to take the match into sudden death extra time before Oscar Ouma scored the all-important try, his second of the match.
Ben Ryan's side booked their place in the final beating Samoa 21-19. Trailing 12-0, Christian Lewis-Pratt (twice) and Marcus Watson gave them a 21-12 lead which proved enough despite Lio Lolo's effort.
The hosts New Zealand are the only side to have made all four Cup quarter finals this season and booked their place in the semi final by beating neighbours Australia 24-5 thanks to two tries from Gillies Kaka.
In what was arguably the most entertaining quarter final, Kenya defeated African rivals South Africa 21-20. Having trailed 15-7 and 20-14, Willy Ambaka scorched away to score his second try of the match to snatch a 21-20 victory for Mike Friday's side with four missed conversions proving decisive for South Africa.
In the first Cup quarter final Ben Ryan's beat the Auld Enemy 31-7 thanks to two tries from both Watson and Dan Norton, while the islanders defeated Argentina by the same score. It is the first Cup competition Ben Ryan's side have competed in this season, having missed out in the first three rounds.
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