irbsevens.com and James Mortimer 01.Apr.2013International Rugby Board
South Africa were 12-0 down at the break, but struck twice inside the first three minutes of the second half to go 14-12 up and then dominated territory and possession to grind out an impressive win, which takes them to second in the Series, ahead of Fiji in third.
USA beat Scotland to the Plate, meaning that the two sides are now tied for 12th place at the other end of the table ahead of the eighth round of the Series, the Emirates Airline Glasgow Sevens.
England claimed the Bowl in Tokyo with victory over Argentina to win a second successive Bowl, Dan Norton scoring two hat-tricks on day two to become only the 19th person to score 10 tries in a tournament, and Canada beat hosts Japan to the Shield
In the Cup semi finals, New Zealand beat last year's champions Australia 35-17 while Paul Treu's side held on to beat France 14-12 with Australia finishing third. England won the Bowl and Canada the Shield in the other finals on day two.
USA earn vital Series points in Plate
USA beat fellow relegation rivals Scotland 17-0 in the final of the Plate to secure vital points towards their Series tally and they now sit on level points in joint 12th ahead of Glasgow.
Earlier, Luke Hume brought an enthralling Plate semi final to a close with a dramatic last-minute try, with the decisive conversion being kicked by Shalom Suniula to win 21-19.
Scotland beat the other Pacific island side, Samoa, 21-17 with Colin Gregor, the man to have played in every minute of every match this season with the decisive try.
Second successive Bowl for Ryan's side
England recorded a second victory over Argentina at the 2013 Tokyo Sevens to lift a second successive Bowl title and eight points to their Series tally. Dan Norton scored twice to take his tournament tally to 10 as Ben Ryan's side won 38-0.
Norton earlier scored a second successive hat-trick and Christian Lewis-Pratt kicked a decisive conversion as England dramatically beat Wales 21-19 while Argentina booked their place after Valentin Cruz made a last-minute try-saving tackle to prevent Kenya overturning a 12-10 deficit.
Earlier, Agustin Migliore scored the opening try of day two as Los Pumas beat Canada 7-5. Norton scored his first hat-trick against Portugal to book England's place in the semi. Last week's finalists Wales narrowly beat the hosts 22-14.
Canada win the Shield
Canada came from 7-0 behind to beat hosts Japan to lift the Shield and claim three vital Series points. Having lost to the hosts 14-10 on day one, Geraint John's side were able to reverse the result on day two with Sean Duke crossing for four tries.
Six different players scored for Canada as they beat Spain 38-0 to reach the Shield final. Katsuyuki scored a dramatic try for the hosts Japan to book their place in the final after beating Portugal 19-15.