PERTH, Australia — South Africa won the Australian stopover in the sevens world series for the first time in nine years after topping Fiji 21-19 in the Perth final on Sunday.It took a phenomenal second try by Ryan Oosthuizen, who crashed past four Fijians, to tie the score at 19 that was then converted from the sideline by Ricardo Duarttee.“I’m not the fastest guy so sometimes I need to run over people,” Oosthuizen said.New Zealand women won their third leg of four in the series, beating defending Perth champion Australia 29-7 in the 31-degree (C) heat and ending Australia’s 10-match home win streak.South Africa pounced on two Fiji errors to blast off 14-0 in four minutes. Duarttee converted tries by Oosthuizen and Sebastiaan Jobb.But Fiji has been the comeback king lately. It rallied from 12-0 down to beat France in the Singapore final last weekend, and beat South Africa from 14-0 down in pool play on Saturday.Terio Veilawa was at the center of Fiji’s rally, setting up tries for Viwa Naduvalo and captain Jeremaia Matana to trail only 14-12 at halftime. Veilawa then claimed the second-half restart and broke two tackles on his own 22 line to score the go-ahead try, converted by Iowane Teba for 19-14.But South Africa regained the lead when Oosthuizen high-stepped to his second try and Duarttee slotted his second big sideline conversion.The last five minutes were all defense. Nacani Boginisoko made a try-saving tackle near the right corner flag on South Africa’s Donovan Don, and Luan Giliomee pulled off a try-saver on Boginisoko on t …